Reddit reviews StarTech.com 8in USB OTG Cable - Micro USB to Mini USB - M/M - USB OTG Mobile Device Adapter Cable - 8 inch (UMUSBOTG8IN),Black
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Connect your USB On-the-Go capable tablet or phone to an external drive or other Mini-USB device8" Micro USB to Mini USB OTG Cable M/M / 8in USB OTG Cable / Micro USB to Mini USB OTG Mobile Device Adapter CableConnect a Mini-USB external drive or game controller to your Micro-USB mobile deviceSupport for USB OTG (On-the-Go) capable devices8-inch cable is a portable solution which is perfect for carrying as a tablet accessory
pi zero - $5.00
pins - $8.95
wifi adapter* - $13.33
right angle USB ports - $5.64
USB battery - $3.99
micro-mini usb cable - $2.89
Total: $39.80
*I used an Alfa AWUSO36NH but the TP-LINK TL-WN722N should work. More information on compatible network adapters here.
The optional Illuminated LED shutdown switch makes this device easier to use but costs an additional $16.99
About
PirateBox software runs on inexpensive hardware to connect users over an offline wifi network. Join it and your browser redirects to a simple interface where you can share files, chat, and stream video.
Pifm is a small program you can install in a Raspberry Pi PirateBox, aka “pi(rate)box.” It can broadcast on FM radio to inform potential users about the PirateBox wifi network, play uploaded music, and with a USB microphone Pifm lets you talk live to your audience.
Improvements
The first version of this project was well received so I'm back to share design and documentation improvements. Pi(rate)FM Zero is now fully self contained. It turns on and off with a button press and can automatically broadcast information about the wifi network over empty FM stations at user defined intervals.
Why not use a car/smartphone FM trasmitter?
You totally could. It might even be better in some situations if you don't mind a slightly larger, more expensive device with an extra battery to charge. Keep in mind you'd lose the ability to live broadcast with a microphone or play audio directly from the PirateBox.
Going forward
In my next version I'd like to improve the PirateBox interface and make a way for users to rate playlists while having Pifm automatically play the highest ranked tracks. Users could upload music and vote on which tracks gets played. It'd be your own personal short range interactive digital-analog radio station hosted on a private intranet.
Bonus**
Here's a .img file for your convenience. Just install it to an SD card (at least 4 gb) and run it in a Pi Zero to get started. Note: auto broadcast on FM isn't enabled by default so you'll need to add a cronjob as detailed in the guide if you want to activate this feature.