[H]Insurgency(1k/30 cards)The Darkness II(1k/30 cards)Terraria(2ref) | PACK OPENINGS ONLY! :

As the title states, you can get

The Darkness II - 1 key or 30 cards (5 keys colleteral) (6 keys total) [6 in stock atm] (0 sold)
Insurgency - 1 key or 30 cards (6 keys colleteral) (7 keys total) [5 in stock] (22 sold)
Terraria - 2 ref (2 keys colleteral) (2 keys + 2 ref total) [10 in stock atm.] (11 sold)

Out of stock, for unknown time..
Payday 2 - 2 keys (12 keys colleteral) (14 keys total) [0 in stock atm] (4 sold)
SpeedRunners - 1 key (6 keys colleteral) (7 keys total) [0 in stock] (8 sold)
7 Days to Die - 4 keys (5 keys colleteral) (9 keys total) [0 in stock atm] (22 sold)

These prices are for pack openings only, if you have a good rep here, you can open w/o colleteral!

Just add me, but please leave a message here before ;)

How to check whether you are eligible for unpacking a 4pack

First and Foremost, You MUST NOT own the game in your library
Second, Follow these steps

Go to the steam store mainpage.  
Add any game into your cart  
Select Purchase as a gift  

Your steam account is not eligible to open a 4pack if the page looks like this - http://i.imgur.com/nXTCSbt.jpg
Normal Steam account with good standing will be directed to a page like this - http://i.imgur.com/odUbPpE.jpg