"Should of" is not grammatically correct. The proper use is "should have." This is commonly abbreviated to the contraction "should've."

Same thing for "could of." The proper use is "could have" which is abbreviated to the contraction "could've."

Flame, me, I don't care, I can't take it anymore.

Oh, and you don't 'loose' money/subscriptions/time. You LOSE it. Loose is the opposite of tight.