Several members have bought from this Ebay merchant and found good prices on repaired/reconditioned BEA & Bostich staplers, the 1/2" is used more for vinyl and the 3/8" for cloth:
http://stores.ebay.com/1TO4-TOOLS-and-MORE/Staplers-/_i.html?_fsub=113847&_sasi=1&_sc=1&_sid=31494532&_sop=1&_trksid=p4634.c0.m322
P.S. - I don't think you want any models that say "autofire"
http://stores.ebay.com/1TO4-TOOLS-and-MORE/Staplers-/_i.html?_fsub=113847&_sasi=1&_sc=1&_sid=31494532&_sop=1&_trksid=p4634.c0.m322
P.S. - I don't think you want any models that say "autofire"