OK. This seems to be a bit of a weird site but the keys do work.
Pay currently $1.49 and you get 7.62 High Calibre, 7.62 Hard Life, Death to Spies, Death to Spies: Moment of Truth, NecroVision, NecroVisioN: Lost Company and El Matador.
BUT pay $1.54 and you get double the number of keys that you can either give away (Hint Illusionary) or trade for points.
Trust me. The price is worth it just for the Death To Spies games (very much Hitman-esque).
2 things to note: One you have to buy the games, THEN create an account to actually get the keys (WTF!?) and secondly I got a little concerned when I saw the paypal statement as showing up as paying 'Robert Muresan' but everything went through okay and I got all keys including their doubles.
Lastly be aware that this is in DOLLARS so make sure you set Paypal to either use their conversion rate or your credit card's.