I have this lovely well-made-in-USA (from RADkidsFurniture in LA) Pickler Triangle with a separate 58" slide/ramp. It cost $445 + shipping new.
In great shape, with only a few child-added stickers (easily removed if you care).
Open it is about 27" wide. The climbing side is about 47" long and height when open is 40". Has a screw in bolt to keep it open/closed. When folded it's about 8.5" thick, and 47" long. Stores in a closet or under bed easily.
You could put it outside to use, but it's not meant to stay outside overnight.