I happened to be mattress shopping right now and just spotted this Zinus 10 Inch Hybrid Green Tea Foam and Spring Mattress at Amazon for just $151! This is a great deal and I am going to be placing an order for two for my kids.
This item will ship free for all Amazon Prime members. Or, regular members can score free shipping by adding $49 or more worth of eligible items to your cart. You can get a 30-day free of trial of Amazon Prime here.