I have a Zinus I paid like $250 at most on it and it's the best mattress I've ever slept on. But, I ordered one for the guest room and it did not fully expand, so I talked with Amazon and they sent me another one. I took the first one apart, it's pretty simple set of I vaguely remember 4 layers of different foam types. Making these mattresses is pretty simple for all the brands, so the profit margin on an expensive name brand is very high. All you need is a good vacuum and decent packaging for the foam types. I have no idea why anyone would pay $1000-$3000 for a mattress.