More of a challenge is to find a less than $15,000 used sporty car you'd like to own as a third vehicle to drive around on nice days for the heck of it. The Saturn Sky would be on my list I think, if one had a manual and was in decent shape.
I'd want a convertible, a manual, not crazy horsepower but decent, two seater, some room for an over night bag, depreciated pretty much, not too old so it has fuel injection.