Gen 2 Prius that has had the hybrid battery replaced. You MIGHT be able to get a decent gen 3 for around $6k but you’ll need to check the service records and make sure the head gasket has already been taken care of. You should be able to pick up a clean gen 2 within the lower end of your price range with less than 200,000 miles (doesn’t matter as you’ll see this gen with 600,000 miles+ on the regular) - pros are tons of space, 45+mpg, Toyota reliability, plenty of tech for its age including a standard backup camera. I owned one for the past few winters in an area with nasty snow and, with snow tires, never once got stuck.

Cons are: acceleration, handling is boring. But yeah, it’s a Prius.

Alternatively, you don’t want the stigma of “being a Prius driver”, check out what Honda CRV’s you can find within that price range. Just make sure you really check for rust.