Most would probably take 1 confirmation... I believe
https://www.gyft.com/ only takes one?
You could also try looking on here but I'm assuming you'd want them faster?
I see. The issue I have with the confirmations is that with smaller valued gift cards (and thus, payments), the confirmation takes longer. I don't want to pay a huge miner fee either.
There isn't a site which would release gift cards or any product without confirmations for the obvious risk of double spending. Like monbux said, gyft requries only 1 and is probably the safest and fastest way to buy an amazon card.
Confirmation usually won't depend on the amount, and paying a huge miner fees today probably won't do any good. Confirmations have been slower today specially.