I'm doing research on crib mattresses and is it me or are they really expensive? If possible I'd like a good one for less than $75, but all of the ones that come highly recommended are $100+. It's not that I don't want the best for the baby, but money is tight and while I would like to think someone would buy my mattress for me as a shower gift, I don't like counting on those things and I'd rather budget for it instead. I need some justification in my mind... The crib we registered for is a convertible one, so does that mean we'd be able to use the same mattress once we change the bed to a toddler bed? Or even better, do any of you have recommendations for mattresses closer to or less than $75? I want something good, but with the cost of everything else we need for the baby, I just want to try and keep costs low.