CL will be your best bet. Even ebay for a new one. I would suggest not getting a slide. Our daughter, family and friends did love it, but it was pretty much a hassle, one kid not going up the ladder fast enough, one sitting up there too long.....
We had an "adult" party a few years back. Everyone was drinking having a great time. One guy fell off the slide ladder. Had to call the ambulance, he spent several hours in the ER getting stitched up. Thankfully he did not sue us!
We sold it on CL latter that year.
I don't think it would crank up your insurance just having one, but the liability of an accident could potentially be costly.