I have two twin XL mattresses: one is firm, and the other is medium firmness. They are the Costco Comfort Tech 10" Serene Foam II Mattresses, which cost about $250 each new. I have had them for about a year, but they haven't been slept on because we haven't had any overnight guests. They are very much new, better than new, because they are completely aired out, with no chemical odor whatsoever. I am asking for $99 for both mattresses, or $60 each. I have a new gap filler that costs about $50, and you can take it for free if you buy both.
The bedframe is similar to the Amazon Basics metal bedframe that sells for $150. They are very sturdy, supporting 700 lbs, and they make no noise, even if you jump on the bed. They can be taken apart for easy storage in the closet. They can be combined to make a king-size bed or used separately as two twin XL beds. I am asking for $30 for the entire bed frame.
Two mattresses + bed frame + gap filler = $120
I am selling these because my wife prefers a queen bed in the guest bedroom rather than a king.