I set up alerts on OfferUp and Craigslist for a Nordictrack ski machine. Got one back in April for $100 and have used it 6-7 days a week since. It fits in a relatively small space, doesn't require power, and is 100% user serviceable. I have it along the wall in the garage, and can fold it up if need be. I only do my "long" workout on it, but am planning to try my first HIIT workout on it tonight!
I also have started doing the kettlebell routine from the book "Simple & Sinister" using a 16 kg kettlebell I bought ages ago and never used. The /r/kettlebell community is very, very helpful. I was, to be brutally honest, intimidated to start this; I was sure that I would somehow do the exercises wrong and wind up hurting myself. However, nothing bad's happened and I do feel better/stronger.
Finally, I've done more reading on health/longevity (most recently the book Lifespan by Sinclair) and have modified my eating habits a bit.
The pandemic sucks, but being forced to come to grips with months of my life being heavily restricted served as motivation to live healthier so I can make more use of the time that's left once (a) a vaccine come around or (b) I figure out how to immigrate to New Zealand and live a normal life :-)