try nicehash or miningrigrentals.com , just a word of caution unless you re mining a new altcoin renting miners is pretty unprofitble
I would defenately vote for miningrigrentals, they have this really nice buyer protection and rig rating feature... I have had positive experiences with them in the past. But look out, like XERES mentioned: if you're just mining for an old ALTcoin, chances of making a profit are very slim... People renting out hash ask a little more than they would make by just using their hashpower themselfs (pretty logical if you think about it really).
