Can you use more than one amazon voucher?

Yes of course you can, but again depends on the item you buy. It's not easy to stack two coupons but it;s possible, let's say you buy a TV from Amazon and grab a percentage discount coupon and on top of that you can stack free shipping coupon code if it's available but to stack coupons you have to be good on timing and choosing the right products. There is lots of Amazon coupon codes available now before Valentine's Day.