I guess the OP needs a cheap mining set up and cloud mining seems too expensive but it depends on which algo and coin he wants to mine, i would have said he should try bit-x.com.
No, i need this farm not for mining. Just for mathematics calculations. It will have average load near 50% that is lower then minig need as I know. So any service in cloud is not suitable for me.
Exactly what i am thinking but because you left us with guessing since you did not mention what you need it for in your announcement thread.