This is a hard one hey! You want to buy what is the best for your child but only want to spend what you have to to get that don't want to waste money if you don't have to. When we were buying one for Noah...just under 2months ago. We were in one particular bed/mattress shop where we were looking at the range of innerspring mattresses and I asked the lady what were the difference in the mattresses when comparing prices she said in the same brand they are exactly the same on the inside just covered with differnt materials on the outside to make them look better pretty much. i.e the satin covered one was more expensive than the cotton covered one

We spend about $150 i think on the innerspring mattress and Noah seems to be very comfy and happy with it, we can lay on it and its comfy. Kids don't weigh much, our had a 5yr warranty, which is how long they say you should sleep on a mattress anyway so I was happy with that!