Bitcoins is Spreaded all over the e-commerce business and internet,don't know how much list can i comment here, in think you need to do proper keyword research on it whether you are allowed to exchange bitcoins for currency or whether you are allowed to pay in bitcoins and whether is there any taxes or premium involve in transaction, you can easily google it and find the top places where you can use bitcoins for necessity things.

Amazon are offering Vouchers and Coupons on Bitcions, i didn't get to know whether they offer Bitcoin as payment or not .By the way thanks for sharing the links here, it will easy for me and other to book mark and use it for future purposes.