I'm not sure what area you are in, but the want add for MA,NH,RI,ME has them every week in the boat accesories section. Prices range from $8-$25 used, some of these adds have hundreds, others only a few.
Two suggestions, National Fisherman and there are plenty of lobstermen in Pt. Judith RI that would be willing to sell some to you. There is also a place right outside the pt that sells new and used wire pots. I baught 15 from him about three seasons ago for 5 bucks a piece and are still using them. If i find the phone #, i will post it