Are there any safety rules for purchasing a mattress for a four year old? Does it have to be firm? Can he have a memory foam if he wants it? Etc. I haven't seen anything for preschooler's but of course remember there were guidelines for his crib mattreess. Any tips?
What is a reasonable amount to spend? I want to get him something decent but it isn't going to be forever. Ty 
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Re: Rules and budget for a twin mattress?
We didn't get anything with memory foam, but it wasn't for safety. For DS1 we spent around $300 on his mattress, for the twins we spent around $150 each. Eventually we'll get the twins new mattresses and they'll be the nicer $300 ones that I wanted.