This game is not steamworks, but still keys should activate on steam.
See http://forum.maniaplanet.com/viewtopic.php?f=264&t=18767

TrackMania 2: Canyon
Store Page: GamersGate[www.gamersgate.com]
Steam Page: Steam page TrackMania 2: Canyon
Price: 8.41€ per copy or 11 000BLC
Payment Method:
Paypal (You pay fees)
Bluecoins gift (Bluecoins[www.gamersgate.com]) (NO FEES)
(Can be bought using paypal)

Notes about paying in blue coins:
You can't give blue coins tied to your account, instead you must buy as gift from that page.
Blue coins are tied to USD, so 11k BLC costs exactly 11$. (Euro price changes many times a day.)
Sometimes buying more smaller blue coins packs is cheaper and you can save few cents.
But downside is you can't buy more than two times same product and thus it takes longer.

Currently:
11*1000BLC = 8.36€
2*5000BLC + 1000 BLC = 8.40€
10 000BLC + 1000BLC = 8.41€

Basic information:

• SteamRep Madjoki[steamrep.com]

1 (me)
2
3
4
5

If you have any questions please post here or add me, and ask them!

GamersGate let's you any buy only two times and theres no way around that in these packs. So it's possible to buy another pack should there be interest.

Added. Only few hours left to complete payment. (Limit is somewhere between 24h-36h from what i've read.

引用自 Haters Gonna Hate Brah!：

can i pay with steam wallet?

Unfortunately there isn't anything I want atm.

Sniper Elite: Nazi Zombie Army
Price: €13.19 | 3,3€
Total price: €13.19 17 305 BLC on Gamersgate with -20%
Payment: Paypal (you pay any fees)

Basic information:

• SteamRep[steamrep.com]
  
• Theres still few hours left so I figured i might contibute by hosting even if i'm not very interested in this game.
  
• (I believe you can still pay after deal has ended as long as you have made order upto payment. Which would give extra few hours if someone is interested in this group buy)

1 Sepp
2 Sepp
3 Adrian (waiting payment)
4 Sepp

If you have any questions, please add me, and ask them!

I'm not interested in this game but I have 20% discount so I could host if theres 4 buyers and no one to host.