I ain't gone over everyone else exciting ideas and probably more adventurous but this is what i got so far.

https://BuyPTCGOnlineLive.Codes

I'm working on a discord bot that allows manually/automatic payment for Bitcoin or Ethereum.

These codes that I have stocked up on are worth anywhere from 10p to £9.99 depending how we go about it.

You can also look here and post here if more interested; https://bitcointalk.org/index.php?topic=5500435.0