There is this https://bitcointalk.org/index.php?topic=343311.0 then they moved to https://bitcointalk.org/index.php?topic=738930
I never used it but I guess you can decide weither to use it or not based on what people were  saying on both threads .

but it seems outdated or something , how come CS:GO costs 17$ lel ... while it costs on steam less then that (with or without sales)