Best, Cheap Proxies?

I don't know why but when i try to look for proxies on google, my mind just gets boggled and i don't know what to do... Lol
Since I'm not good in this field, can anyone recommend me websites that sell best, cheap proxies?
Realistically i just need one proxy, for now, I would like to know how long they last as well.

Any help would be appreciated and i think it would also help any newbie out.

Thank You.

How long they last on what platform?

Have you tried the marketplace?