Just an idea for possibly cheap advertising…
I think it’s great for business for gamers to do video streams, walkthroughs, playthroughs, etc.
Why not incentivize them to do so?
Affiliate links unique to content producers on youtube, twitch, etc. would make them want to attract viewers because the idea is that viewers will use their link for something like 3 to 5 percent off, and the owner of the link gets paid a small percentage of the sale of the game, trackable by the link.
Of course funds may have to be held for a period of time to cover chargebacks, etc. but I think it would work.
A standard addition to the ToS would have to apply, stating that they can’t use their link in SPAM, etc. etc. etc.
Another option would be to try and set up something via Linkshare, or Commission Junction (I think they now go by CJ Affiliate), or one of the other major affiliate link programs.
Doing it this way lets them take care of the legal work and payment (I believe).