I know there are a lot of ways a td sleeping area can be finished when it comes to picking out a mattress. My concern was a great nights sleep.
This was a little pricey, $229, but it is a 8" Queen sized mattress from Walmart. It is a full 60" x 80". The bottom 5" are high density foam and the top 3" are memory foam. It has a nice off white cover.
I can get it in and out through the doors by rolling it up and using some of my kayak straps to make it smaller. It should store well indoors through the winter and will be perfect for those times the family visits and I need an extra bed!
Barb