If you're unaware what TF2/Dota 2 keys are, see here;

Dota 2 Keys are commonly used to refer to Dota 2 keys (Treasure Keys).

TF2 Keys refer to TF2 Keys (Mann Co Crate Key).

0.5 Keys = Tour of Duty Ticket (Note: Only one of these per trade, not 2 of them instead of a key).

They're commonly used to trade for games various subreddits and trading websites and can be bought for approx $1.80 on /r/dota2trade and /r/tf2trade, as well as on the Steam Market for a higher price.

Links

/r/SteamGameSwap Profile is here (50 trades confirmed).

Wishlist

Send me a trade offer

XBox

Multiple 2-week Trial Live codes. (let's you play online, but may not include some other benefits such as multi-account usage from one XBox) - 3 Keys

Steam Gifts

Bully: Scholarship Edition - 3 keys

The Witcher 2: Assassins of Kings Enhanced Edition - 3 keys

Natural Selection 2 - 2 keys

Time Gentlemen, Please! and Ben There, Dan That! Special Edition Double Pack - 1 key

Overlord Raising Hell - 1 key

Steam Codes and URLS

Inversion (region-locked - will work in North America and nearby countries only - see country list here). (Bought from Amazon) - 1 key - 4 copies remaining