I used this site before[1]; I do not know the current status of that site so search first, also if you are looking for a reduction, I do not expect that site is appropriate.
You can find such cards using Paxful[2] and bitify.com[3].
Move your topic to the Digital goods section,
Use escrow Before you do deals, there are many of scammers
EDIT:
you have an active sell on that section, so please lock this topic.
30. Similar marketplace items must be listed together.
[1]
https://www.gyft.com/buy-gift-cards/google-play/[2]
https://paxful.com/[3]
https://bitify.com/