Here is an example of what I'm looking for:
Vintage Exercise Bike Painting by Justin Allen found here
I've found quite a few on eBay, but non close enough to pick up. (They are a little too expensive to ship!) I don't know how likely it is that I'll find one in working condition, but I definitely will be on the lookout :)
Have you ever thrifted any exercise things? This will certainly be my first!