Actually, there's one in PackardsCorner. I dont remember the exact location or name, but I was actually quite impressed. I was there about 2 yrs ago and I found sooooo much stuff there, including a Dior Monsieur cardi (Made In England--obviously pre-Slimane) and 2 vintage Lacoste sweaters w/ blue alligators..and the furniture selection was pretty good too..
Ive heard JP (Jamaica Plain) has excellent thrift-stores too, but I couldnt tell you which ones or where. My former co-worker said one of them is off the beaten path & looks like a total s-hole from the outside, but once inside, you'll find a great stock of A LOT of vintage Levis in mint condition.
Best of luck if you find 'em!
BTW--Bobbys? Never heard of that one..Where in the S. End is it?