Other things - door frame pull up bar, resistance band. Cheap, get a lot of use, don't take much space.
One of those shiatsu machines with infrared - used one almost daily for a couple of years. Great for upper back/shoulder muscle tension release while sitting on the sofa in the evening.
Sheepskin slippers, merino/cashmere sweaters. Sheep really know what's up when it comes to keeping cozy.
80's Yamaha U3 piano. Just great to sit down with now and then, deep immersive sound. As good as it gets with an upright. Doesn't really depreciate in value.
Yamaha C40ii classical guitar. Can't really go wrong with these, great bang for buck.
Plants - fruit trees and vegetables. You can grow these from seeds for free if you want, just need space. Made my life a lot better.