You can buy Amazon codes or stuff directly from a couple of places with bitcoin (some you can get a discount and some you can't):
https://purse.io/https://all4btc.com/https://brawker.com/https://www.cryptodechange.com/product/amazon-uk/Probably not going to get any discount with the current situation going on its unclear wheather Bitcoin will be valuable in the near future due to the core developers arguing and threating to leave bitcoin.
Speak for yourself. Bitcoin will prevail past the uncertainty of the blocksize which is going to get changed eventually it's just a matter of when.