Do you know what is good and cheap spray for erectile problems?

No: No, because there aren't any. More importantly though not always, things that are good aren't cheap and things that are cheap aren't good. Seriously, there are no approved sprays for erectile dysfunction. Pills, yes. Injections, yes. Urethral suppositories, yes. But none are cheap. Vacuum pumps are another option to be used in conjunction w/penis rings but probably aren't cheap.