Craigslist is ok but the real go-to is government auction sites.
There's a high school near me selling a decent condition bodymasters 45 degree leg press, leg curl, assisted chin and leg press for $150 in a single package. Hell, I'm getting 1400lb of pro dumbbells from them for $50. High schools practically give their shit away because Tax Dollars are free.
If you live near a major U they often sell off huge amounts of gym equipment for insane prices but be prepared to be outbidded
I ended up paying $700 for mine (delivered), but I bought a Hammer strength leverage press for my home gym and had to go on CL to find one. If you do them correctly (dead stop reps) the HS doesn't need much weight to be super hard
never buy any 'home' shit, it'll be more expensive than pre owned gym equipment and far worse quality