Selling Valve Complete Collection 13 keys only or offer

Add me or you can send offer here if i'm offline : http://steamcommunity.com/tradeoffer/new/?partner=131059854&token=cLw0sK8C

This pack contains:

Counter-Strike
Team Fortress Classic
Day of Defeat
Deathmatch Classic
Half-Life: Opposing Force
Ricochet
Half-Life
Counter-Strike: Condition Zero
Half-Life: Blue Shift
Half-Life 2
Counter-Strike: Source
Half-Life: Source
Day of Defeat: Source
Half-Life 2: Deathmatch
Half-Life 2: Lost Coast
Half-Life 2: Episode One
Half-Life Deathmatch: Source
Left 4 Dead
Half-Life 2: Episode Two
Team Fortress 2
Portal
Left 4 Dead 2
Portal 2
Counter-Strike: Global Offensive