This post is from a low-reputation account and contains an unverified outbound link. Be cautious before clicking external links.
Dual Mine -
BTC - Buy 1000 GH/s and get 2000 GH/s for Free lifetime contract - total you get = 3000 GH/s for 1000 GH/s price
ETH - Buy 1 MH/s and get 2 MH/s for Free lifetime contract - total you get = 3 MH/s for 1 MH/s price
Example: Buy 10 TH/s and get 20 TH/s Free (you get total 30 TH/s with a 10 TH/s price)
Works like a charm and super technical support. Never missed a payment so far from past 9 months.