Reddit reviews Nintendo 3DS Stand

https://www.amazon.com/Nintendo-3DS-Stand/dp/B0072B39BM

The only thing that comes to mind are these stands that they made for Kid Icarus Uprising. It can support the 3DS, but it won't change button configurations or anything like that. The 3DS family of systems are notoriously bad for peripherals like a hookup or capture cards and software. Someone else may have other suggestions, but none are coming to mind for me right now

Evecase 5.6 x 5.6 x 3.5 inch Camera Bag.
Chose this after trying too long to find a 3DS bag that didn't have horrible straps. $16 with Prime

Anker USB 3.0 4* USB tap.
Obviously, you need to have more than 1 USB port to do much, like using a mouse with a usb drive.
$9 with Prime.

Cable Matters Mini HDMI male to HDMI Female cable 2 pack.
Minor shaving required. Not tested extensively.
$10 with Prime.

Lexar USB 3.0 Micro SD Card Reader
If you want to use a ferry card or temporarily pop your card of choice into a computer, one of these is incredibly helpful. Plus it's tiny. You can probably get one cheaper if you don't want the 32GB card included.
$33 with Prime.

Standard XBOne Controller.
Works without any need to mess with dongles on Windows 10. It'll even work with headphones/sets.
$35-$50ish, depending on color and luck.

Venom Xbox One Rechargeable Battery Twin Pack.
I don't recommend these in particular, but a rechargeable pack is a must if you don't want to guzzle batteries.
$17 with Prime.

Logitech Wireless Mouse M185.
Pretty reliable, but only has the standard 2 mouse buttons plus tilting and clicking mousewheel. Receiver stores inside nicely.
$13 with Prime.

Kid Icarus Folding 3DS Stand That I Had In A Box.
Needs a little rubber bumper to help secure the Win properly.
$10 with Prime.

Perrix Asymetrical Folding Keyboard.
This one might be tough to find, but it works amazingly. The weird fold system pushes the main hinge off to the side, so it is less likely to fold the moment you put it on your lap. It also completely hides the hinge when the keyboard is unfolded. A bit cramped, but the keys are properly clicky laptop keys.
For image and model reference

Anker PowerCore 26800 Portable Charger*
While looking for my power pack, I found this one. Seems to be a flat upgrade. 26800mAh with 3 4.8A output USB ports. Also has 2 micro usb inputs for double the charge speed?
$59.99 with Prime.

Other possible pack-ins.

Bluetooth Numpads.
If you're primarily going to be gaming, you might want to drop the full keyboard in favor of a bit of space plus one of these. Works nicely with a mouse if you rebind with HIDMacros. Also more tiny airport/college desk friendly. Example unit is $30

Similarly, you might want to try a half controller + mouse option using a device like the Nintendo Joy-Con's left unit. Drivers are still being worked on though, so only get this if you're up for beta troubles.
$50ish, but you can get lucky on eBay.

SanDisk Ultra Fit 128GB USB 3.0 flash drive.
The one in all the Win lists I've seen, but I figured I'd list it here for convenience.
$45 with Prime.

Batteries
All this stuff takes a total of 3 AAA (2 for the keyboard, 1 for the numpad) and 1 AA battery that will need replacing eventually. I hesitate to recommend rechargeable ones, as I have yet to find a micro charger for them.

Inateck USB 3.0 Ethernet + 3 USB 3.0 port adapter.
You might want to replace the 4 port one with one like this if you plan to do network maintenance, secure data transfer, or just plain download things quickly.

$20 with Prime.

PS4 Controller.
Some people prefer this to the XBOne one. It's lighter in the hand (and bag), comes with a built in rechargeable battery with absurd life, and has a touchpad with 4 physical buttons underneath. Can do some pretty crazy things with the touchpad via Steam's controller customization, but has weaker compatibility with non-Steam applications. Also works with PS4 Remote Play.
Worth noting that, unlike the ps3 controller, this can charge directly from any micro usb power supply. Headset support seems to require the official receiver dongle, sold separately.
Controller Alone: $40-60 Depending on color. Silver's cheapest.
Adapter Alone: $66
Controller + Adapter Bundle: $66

Budget 1 Handed Controller**
Hey, if you want to try 1/2 Controller + Mouse, why start off pricey?
$10

Phew, that's about all I have on hand.

is this the bad boy? http://www.amazon.com/gp/product/B0072B39BM/ref=ox_ya_os_product_refresh_T1

There is a 3ds Stand that came with Kid icarus before.
http://www.amazon.com/Nintendo-3DS-Stand/dp/B0072B39BM

Here a link to amazon. I can tell u that it does work with XL size and it should be no issue with the New XL either

I use this:
https://www.amazon.com/Nintendo-3DS-Stand/dp/B0072B39BM

It was from Kid Icarus for 3DS, does wonders.

The price is straight stupid here, but there are links to other ones that can do the trick really easily

Yes, the whole game you will be using the touch screen so you will need a stylus. And, you will have to be a little more still while playing, compared to other games, which is hardly noticable, but you don't need to have the stand. Even though you don't need it for KI, I would still recommend buying it because it makes a great dock, by looking nice, and saves space while not in use. Buying this separately will probably be cheaper than buying the bundle so here is the link if you do wish to purchase it.

Sell it and get the eshop version. You can always buy the stand separate.

http://www.amazon.com/Nintendo-3DS-Stand/dp/B0072B39BM/ref=sr_1_1?ie=UTF8&qid=1422051159&sr=8-1&keywords=3ds+stand

If you have access to a 3d printer you might be able to 3d print your own if there isn't one out there. So if all else fails, I would check on some 3d printing websites to see if there's any models online.

Edit: Looks like there is one here https://www.amazon.com/Nintendo-3DS-Stand/dp/B0072B39BM but again if that's not what you're looking for 3D printing is always an alternative.

The launch edition came with a stand, for good reason. You can buy something similar tho.

https://www.amazon.com/Nintendo-3DS-Stand/dp/B0072B39BM