From memory I think 3gstore.com is a place to start. You'll find the usual solutions so you can continue your search.
I'm trying the share the internet signal from a mobile connection (like Verizon or ClearWire) that comes in through a USB modem. I cannot find a wireless router that would take the internet signal from USB, as opposed to a regular network cable from a DSL modem. There are routers that have USB ports, but those seem to be to share resources on the network, not to take an incoming internet signal.