Reddit reviews Lot of 8 Crystal Clear Hinged Plastic Trading Card Storage Boxes (35-ct) - Made in The U.S.A.

My preferred methods:

1. Put unsleeved cards in a Team Bag. Place a top loader on the front and the back (the cards are sandwiched between the 2 toploaders). I use two pieces of Painter's Tape, one wraps around vertically and one wraps around horizontally. I send cards like this to buylist and seems to work well, since most vendors do not like individually sleeved cards.
   
   
2. Put cards in perfect fits, then put them in a Clear Hinged Box. They make different sizes depending on how many cards you need to send. I like to put them in sleeves because the cards rattle around in the boxes. Not sure if it actually causes any damage, but the sleeves make me feel better.
   
   
   I am not a big fan of shoving a bunch of cards in a penny sleeve, which is another common solution. I've received cards like this, and one thing that happens is that either the front or the back card slips out a little, then the pressure from the other cards creates an indentation in the card. It's happened to me more than once.
   

I just got these in the mail for my copy of Eldritch Horror and they work absolutely perfectly. I'm probably going to order more for my other games that use cards.

You're thinking of something like this?

http://www.amazon.com/Amigo-Spiel-Freizeit-82478-Deck-Box/dp/B00317VSPK

They have even cheaper ones like these:

http://www.amazon.com/Crystal-Hinged-Plastic-Trading-Storage/dp/B00AEAGNVQ

Which end up costing $0.75 US, so that's like 50p

I've recieved cards from PUCA in both and either is fine, the cheaper one doesn't fit cards with sleeves though.