Deposit, buy, and forget
Ref: https://goo.gl/TX44EJ (bonus $6)

Free 25 GHS - Min Buy 50 GHS 0.02 BTC
http://sh.st/OBd1O

minimal buy 1% 0.00684 BTC
https://goo.gl/CJj7Ou

minimal buy 20 KHS = 0.00110200
https://goo.gl/LrP2Ok

minimal buy 0.0001 BTC
https://goo.gl/2tE8O5

Bonus 15 KHS
http://goo.gl/dLUb56