We have a large selection of twin mattresses in store and on our site! I have attached the link below. Hope this helps. -AS https://www.valuecityfurniture.com/search/v/mattresses/mattress-sets/twin-mattress-sets
Huge variability from a couple hundred to a grand, the better mattresses are good for adults, go cheap for kids under a hundred pounds, also check mattress firm, they price match.
It varies from brands best to look website
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