It's also a convenience thing, if you just keep scraping FB Marketplace (or have a friend do it for you :) you can find some deals, just need a little elbow grease and some bleach to clean stuff up. Or I've found some decent deals on new stuff just by watching some good reviews on YT (that aren't sponsored) and keep your eyes on deals. I've seen $400 benches go for like half price shipped. 

Gyms regularly auction off equipment, and local gyms fail all the time, and liquidate their stuff, often pretty new. That's more difficult to come by for me, but I've seen it happen a few times a year.