Every time I go in with a DVD to get the coupon, the experience is always different. First, the employee thinks I want to upgrade the DVD (an anime title which also resulted in a weird stare), then she processes the DVD as a mobile credit and I get a receipt instead of a coupon. This was a red flag for me since I had a similar experience that took 3 hours to fix between two stores going back and forth. She assures me the cashier will scan the barcode on the receipt.
I pick up Dark Knight Returns Part 2 and go to the cashier area where are NO CASHIERS whatsoever; in fact, there wasn't even a security guard at the front entrance. After about a minute of standing "in line" (there was no line), I go back to customer service (also no line) and pay $10.59 for the Blu Ray.
Apparently if you're not buying a computer/tablet/cell phone [where the majority of the employees were standing], that store isn't interested in anything else you want to purchase.