Traffic exchanger - autosurf with cheapest credits

Hi,

I would like to ask you if you don't know about some traffic exchange program - autosurf, which is the cheapest, in case of paying for credits for surfing your sites.
I am used to Hitleap and Otohits, but the number of delivered hits via these programs is decreasing, so I decided to look for another one.
Here is for example price list of Otohit's credits:



So, do you know about any other program, with cheap and friendly prices? It will help me a lot.

Thank you and best regards!