Good point. It just seems like $800 is a lot of money and there should be a cheaper way, at least in my mind. I have not bought mattresses for so long I wouldn't know the current values at all. How much would 2 new twin mattresses cost if you bought the frame from Craigslist? Also, I believe there are plastic cases you can buy that completely encase the mattress to keep dust mites away. If I need an $800 item and I don't have the money I try to figure out an alternative. Even if I do have the $800 if I think it's too much I will do that.
Shouldn't it be possible to buy bunk beds for way less than that on Craigslist or something?
Apart from underwear, beds are the last thing you'd want to buy used. Maybe buy the frame, but many times the actual mattress is the expensive part.