I believe this BOGO deal also works in stores. You can find all the eligible titles on a special SAVESTATION rack. There were a few more titles on the rack at my local BB than what's shown in the above link, including Attack the Block, Battle: Los Angeles, and A Few Good Men. All are $10 for two I believe. (LOA for $5 is a great deal imo.)
Good thing you moved when you did, cuz it looks like the BB BOGO offer is over now. (That was quick!)
A moot point now, but I think I figured out why some titles available in stores were not showing up in the web link. Titles that were out-of-stock online were automatically excluded from the web offer.
Hopefully BB will do another tradein deal soon.
I feel your pain, Jim. You may be able to use your tradeins credits to purchase (some) Blu-ray titles from BB's website though if you place the order in the store using their Express Lane system, with the help of a customer service rep. I believe that's worked for some here in previous promos anyway. Doesn't hurt to ask.
Also, the earlier you get in on the tradein offer, the more likely you are to find the most popular titles (esp. those in the $10 price range) still in stock in the stores, because they tend to sell out fairly quick after these deals get rolling.