BB went through a phase a couple of years ago where they changed their movie media square footage and handed off management of that part of the store to a third party. At the time that happened, they stopped with Upgrade-And-Save, which was that $5 promotion for recycling/trading-in DVDs.
You can check Amazon for options on cheaper movies, including the Used section, plus GoHastings as you mentioned before.
I didn't realize they had outsourced it to a third party. That explains the poor decision (IMO) to integrate the BR's with the DVD's. It's too bad they ended U&S because I certainly spend less money on BR's at BB now since that's no longer an option.