Earlier quoted context omitted.
> Shouldn't providing down payment legally guarantee to buy a service at original said price? Why would it? What does your contract say? It sounds like you just gave a company your money and got nothing legally binding in exchange. Don't do that.
Preorders and reservations of unreleased products are for people who like to get screwed, or for people with so much money they don't care if they get screwed. I know people who preorder AAA games, the game turns out to be crap and they complain about it. "Ugh, I can't believe I preordered this crap." Then a year later they're doing it again... "Doctor, it hurts when I poke my eye!" Uh, then stop doing that.
Obviously you need to be careful, know what your options are to cancel, and make sure you trust the company - especially if they require a deposit. But for me getting something a couple of weeks or months earlier than I would otherwise be able to is a benefit that I am often willing to assume some amount of risk for.