ASUS RT-N13U/B $15

NewEgg has ASUS RT-N13U/B $15 after rebate.  DDW-RT compatible. Also has USB port. Does not have Gigabit Ethernet (not very important for the time being).

Very cheap.

http://www.newegg.com/Product/Product.aspx?SID=u0t0f0fp63180dd0c0s701&AID=10440897&PID=1225267&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-cables-_-na-_-na&Item=N82E16833320059