Find an old 3-speed. I see them all the time on Craigslist. I picked up a women's 3-speed in like new condition at a yard sale for $35. The odometer has 138 miles registering on it. Probably all that bike has been ridden!
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time