Tubes amps are more expensive and too heavy. If you find a used one that is cheap, it probably has issues. I haven't owned a tube amp for 25 years and don't miss it.
exactly my hesitation about buying an older amp. It's not only a concern with older tube amps. Getting an old amp repaired is a PITA. Likely expensive, if you can even find anyone to work on it where you are.
I say this because I have been waiting since mid-October (yes last year!) to find out whether my SWR Workingman 15 combo can be economically repaired.
It's so big and heavy that shipping it off for diagnosis & repair didn't seem reasonable. There is exactly one shop in my entire state that is willing to work on discontinued/mfg-no-longer-exists amps, so that's where the SWR has been the last 3 months.
@jakobdoesathing I urge you to consider a new, modern, lightweight, solid state combo amp, unless you
1) KNOW you won't be moving it or
2) have someone to help you move it when needed.
I've owned heavy amps, and it sucks if you ever need to move the thing. Doesn't matter what shape you're in. Even if you're young and strong, a big heavy amp can put dings in walls, tear up vehicle interiors, and cause accidents and injuries, so I'm avoiding them as long as possible.
The Fender Rumble 500 should be within your budget, if bought used. Preferably, from a nearby Guitar Center, so you can bring it back if there's anything wrong with it. At 37 lb., it is feather-light compared to my old SWR, yet with more power.
What you should buy also depends on how you intend to use it. Since the SWR would not be back any time soon, I bought a Markbass Black Line CMB101, and I've been very happy with it. "Only" 40W is plenty for home practice. If and when I start playing outside home, I'll look at something more powerful, if required.