The BB near where I live still carry the Koss KSC-70s, if not, try to look for any Koss KTX Pro 1s, as they use the same drivers. I've heard some good things about the Koss UR-20/25s aswell, considering their price. Just stay away from the Sony MDR-V150/V250Vs. I'd include the V300s aswell but their price dropped drastically here (from $70 to $40CDN) making them actually worth the money IMO.
If you want earcanals. You can try out 'The Plug' from Koss, or if they carry them, some Sony EX51s. As for cheap earbuds, the Sony MDR-E818LPs pretty much wipe the competition of whatever other earbuds BB may have under the $20 price range.