Hi!
Just found this interesting router at TP-Link site - TP-Link TL-WR820N:
http://www.tp-link.com.cn/product_406.html
It is a 300M 3G mains powered router, active USB port, 2 LAN 10/100 ports.
You can get it at AliExpress for less than $30 USD shipped, looks interesting!
I am unable to find any specs for this device, do you think it will be able to run OpenWrt?