Actually, paying doesn't get you the solutions. You only get those when you write the code yourself. Paying will get you someone to guide you towards the solution, hinting what should change and what shouldn't, and providing a dialogue.
But the complete instructor's solution? Not given until YOU provide YOUR solution and pass all their nit-pickery (i just made up that word), and then only for the one problem.
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors