If you search the internet for sliding barn door hardware you'll be shocked at how expensive they are. Miranda wanted one and I wasn't about to shell out $400, so I just made it. The 'hooks' on the door are 2" plate steel that I heated with a torch and bent around a 1" dowel. The long slider is just another piece of plate steel. The wheels are garage door pulleys. The round attachment points touching the wall are dowels with a lag bolt through the middle. Everything including nuts and bolts were hit with black spray paint. I probably could have found something cheaper than buying the plate steel at Home Depot, but even with that I probably have $50 in this setup.
Closeup of the garage door pulley.
... and yes, it slides like butter.