At $300 I would buy it to part out and make a profit if the plastics weren't buggered already.
But I'll second the advice to keep searching. I scored a 2007 ex250 that looked and ran flawlessly with only 6k miles last year. I use it as my commuter and "scooter" to run errands.
The things can be exceptionally reliable and are in my experience.
Best of luck,
-Jake