1995 Caterham Seven
A new Caterham Seven can run at least $40k, and will go way up from there depending on options. Or one could pick up a used one like this for significantly less.
This 21-year old Seven is a bit rough, however, with paint chips everywhere, and an undercarriage that shows the driver spent more time driving than detailing. 57k on the odometer is likely more than most Sevens. Still, as small and as simple as these cars are, any work required will likely be quite simple, and this looks likes a bargain despite the needed work.
It’s on eBay in Philadelphia for $23k or offer.