[WTB] AdWords or FB Ad credit, I'll pay in Bitcoin

[SongHunter]

I remember seeing AdWords credits and Facebook Ad credits around in this forum and other forums like Hackforums.net
They are usually extremely cheap, like $100 credit voucher goes for less than $5, etc. They are apparently obtained for free when buying some service/product or something.

I want to buy these vouchers and I will pay in Bitcoin.
They have to be much cheaper than their face value.

PM me, don't post here.
Thanks.