I have not had time to sit down and play any of these games, let alone put them into my Steam account. My friend gave me these keys as a gift, and neither he nor I have used them.
Bastion: http://www.ebay.com/itm/290801488402 - Bidding starts at $2, Buy it Now is $10.
LIMBO, Amnesia, Sword & Sworcery, and Psychonauts: http://www.ebay.com/itm/290801492127 - Bidding starts at $5, Buy it Now is $40.
Braid Lone Survior and Super Meat Boy: http://www.ebay.com/itm/290801497946 - Bidding Starts at $5, Buy it Now is $30
Bastion: http://www.ebay.com/itm/290801488402 - Bidding starts at $2, Buy it Now is $10.
LIMBO, Amnesia, Sword & Sworcery, and Psychonauts: http://www.ebay.com/itm/290801492127 - Bidding starts at $5, Buy it Now is $40.
Braid Lone Survior and Super Meat Boy: http://www.ebay.com/itm/290801497946 - Bidding Starts at $5, Buy it Now is $30