I'm looking for a non-toxic mattress that is on the soft side and not too expensive. I have previously had a cotton futon from White Lotus and from what I remember, my body liked it. This was three years ago and in the meantime I've been using a very old foam mattress (from childhood!) on top of thin, bouncy wood bars. I just moved overseas and my husband bought a used microfiber futon for us which is quite thick, but after just one night my entire right side was horribly sore. Now we're sleeping on the air mattress until we get something else. My intention was to to get another White Lotus futon mattress, but now that I've had such trouble with this futon, albeit not stuffed with cotton of course, I'm still a bit worried about any futon. I'm quite petite and need something not overly firm. Maybe futons differ quite a bit in comfort and softness?
I've also thought of getting another foam mattress from ikea, but it'll probably be much harder than the one I used back home and also much smellier from chemicals. I can't find any used ones on craigslist either. And it doesn't work well on hard wood bars, I don't think I could find the bouncy ones here in the US.