Barely used queen mattress and frame - $500 (New Orleans, LA)

We bought a queen-sized mattress and adjustable frame (with remote) for our guest house.
It’s barely been used.
We’ve decided to offer our guests a king-sized mattress and frame instead so the current mattress has to go.
Original price for the combo was more than $1,000.
We need it gone, so we’re asking $500.