Ridgid jointers are decent tool. Can be had cheap usually?
When the BORG decided to stop carrying Ridgid large power tools in stores, they slashed prices to 45-50% of retail. Each store did it on different schedule, so there was never a formal 'orange' rush to buy them. I picked up both Jointer and bandsaw for less than $300 each ~10 years ago. Due the BORG closeout of several machines from 30+ local stores, Ridgid has a tendency to have lower resale prices on CL .vs. same 'made n China' machine from Jet or even Grizzly. Random Ridgid jointer shows up on CL every couple of months for $200-300, and sell very quickly. Mine sold in 4 hours when I upgraded.
Jointers are pretty simple machine. If the beds are flat, fence is square, no broken broken handles; they work just fine. 6 inch machine runs well with only 3/4HP motor, unless you plane full 6" cuts with max cut depth in hardest woods. I clogged the dust collection chute on my 6" several times with too big of a cut, and motor never complained.
Used prices vary by region, but I wouldn't spend more than ~$350 for used any 6" jointer. Unless maybe it was an almost brand new Powermatic with receipt in hand to show price paid? Even a new model Grizzy will sit on CL for weeks looking for buyer if priced more than $400.
Remember this in world of used tools:
There are hundreds of people just like you searching for cheap used tools. The great deals are gone in less than 1 hour after ad is posted. Tools with near market pricing last maybe a day or three. Overpriced tools sit on CL for weeks.
Note the the hunt for cheap tools is a hobby for some. They grab anything well below market, clean it a little, and re-list short time later trying to make a quick buck.
So set some alerts on CL, FB market place, Letgo, and any local used online market place; and be ready to jump like your arse is on fire when tool in your price range hits the market. Can't tell you how many times I was caller #2,3,4, or even #5; when I called about a used tool in less than 15 minutes after the ad was posted. It tool me over 5 years to get my hands on sub-$300 Unisaw, thanks to retired folks who rebuild tools in this area always beating me in response time to the ads.
Good luck on your tool hunt.