It’s not “old old,” but my best garage sale find was a totally tricked out Yuni Trials with profile wheelset / AlexRim that I sunk many hours into restoring. Definitely worth the $20 bucks or so that I spent on it.
The only reason I don’t ride it more (and haven’t updated with new shiny pics) is because the last thing that needs done is the seat. Right now it still needs recovered and the foam might need to be smoothed out. Thankfully I have a friend of a friend who owns an upholstery shop so I might get a nice professional job done sometime when I get my tax return.