Re: CHEAP BOTTOM PAINT???
Is it going to stay in the water? Salt water or fresh? Slip, mooring or is it going to be a trailer boat? If you remove the boat or if you are willing to clean it alot ..... rustoleum would work.
If you leave it in the water be prepared to clean weekly or do it all over again.
I will try to ease your pain. $100 a gallon of the right stuff saves you MANY hours of work. Even if your season is only 3 months long that is less than $1 a day.
Regardless of what you paid if.... you are going to do it. IMO do it right once and don't worry about it.