I seriously doubt that a large retailer like borders would allow you to use a voucher on such offers.. most retails thought about such things and blocked them years ago.
Worked with Jamba Juice recently. If you go through the checkout flow you'll see that it accepts gift cards as payment. The people behind these promotions are humans as well and they make mistakes, even in large corporations.
Huh, I was gonna say "They thought of this, you can probably only use one gift card at a time, which is why they sell you two $25s instead of one $50". But it turns out that you can use two gift cards at check out time.
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[ 5.3 ms ] story [ 47.4 ms ] thread2) Use the 50 dollar gift certificate from above and get another 10 dollar gift certificate.
3) Keep doing this over and over.
Here is what happens after each step:
1) Money spent: 50 bucks, gift cert $ 60 bucks
2) Money spent: 50 bucks, gift cert $ 70 bucks
3) Money spent: 50 bucks, gift cert $ 80 bucks
...and so on until you are satisfied.