Small Size 2 port Wan Switch wireless router

[Sirius.Lee.Askew]

I am a field network engineer and I am looking for a small size wap or router that has a 2 port switch on the WAN side so that I can plug it in to a drop without taking the computer that is using that drop off the network while I am using its network cable. Any clue where to start. I am looking to bring it with me when I goto a client site and take it with me when I leave. I use a netbook to keep track on service tickets using an internet based ticket tracking system and I don't want to plugin my USB 3G/4G card all the time.

Thanks in Advance,

Sirius Lee Askew