A couple of things:
In MD the Value Village thrift stores are awesome and every Monday is 25% off everything. There are several around Silver Spring, Wheaton, Upper Marlboro.
Check out Fatshionista.com, every Friday they allow "sales posts" where people (size 16+) sell their stuff.
Highest Wt: 274 / LAP-Band Low: 180 / Sleeved at 233 / Goal: 160!