Thumb Score: +1
This works great if you have BB gcs to roll and you want to purchase something thats well under $ 100.
Example: $ 5 Headphones. Add to cart. Add $ 100 BB gc to cart. Click visa checkout. Add Bestbuy Giftcard as payment type. 25% Discount still applies (- $ 1.25).
Tested this myself, but didnt complete checkout as I was just testing this.
Even if you dont have BB gcs, you can purchase gcs you need like starbucks or ebay, and still get full 25% off the other item.
thats all.
Edit: Of course the previously excluded items still apply.