Cycleops are great for the money for a basic trainer. The entry and mid range models are nothing fancy but they work.

I use sensors for speed, cadence and heart rate while using mine. Mostly I use the trainer for light effort recovery rides while watching TV, usually for 1-2 hours, watching my heart rate to be sure it's staying in Zone 1 or 2 at most. Occasionally I'll do interval sessions for 15-30 minutes, but mostly I do my workout rides outdoors when the weather cooperates. But I'm not good at doing light recovery rides outdoors, so the trainer is good for that. I tend to turn every outdoor ride into a workout, which defeats the purpose if I'm doing consecutive workouts without a rest.

Ditto, Canker's suggestion. I see lots of trainers on craigslist and Facebook. People try 'em over winter (or during the pandemic), get bored, sell 'em. The only problem is they'll often sit it in the garage or a closet for years before they sell 'em. The trainers will be fine, but dusty.

But I wouldn't expect to see any nearly new trainers bought in March during the pandemic shutdown for sale soon, although folks who've been out of work for awhile might be desperate.