Forums, blogs, anything is considered if the price is right. My terms are I pay for one month up front and once the ad is legit I renew at 3 and 6 month intervals via Paypal. PM me URL, and all relevant details - if I don't reply your site didn't interest me or you didn't include enough details.
When you say gaming, do you mean gaming in regards to sports or do you mean video games and things of that sort? It might get you some more targeted responses.
Good question thanks, I mean gaming in all verticals: Video Games, Flash Games, Free Games, Sports, and even Casino/Gambling/Poker/Bingo/Blackjack Games.