White Metal Bed Frame with Mattress

I have this white frame that my son only used for a couple months. I just got them bunkbed so we don’t need this. The mattress is one year-old the mattress is a foam mattress. It comes with the mattress cover which  is freshly washed it only has one defect and I took a picture of it. Missing the ball thing. I might have it laying around somewhere. I’m looking for it. Hopefully, I find it if not, I’m selling like this.  Selling it as a set, but I’m willing to sell it separate. I also take offers. I need to get rid of it right away so I can put the bunkbed in my kids room