2005 Spare Tire Size?

Plain donuts are nice, but they're always better with something on them, like powdered sugar, cinnamon, or tread-depth. The one that came with my preowned '05 Aveo has none of the above on it. I'm having a hard time reading what the specs are from the sidewall of the tire. Anyone had to replace one? If so, what size do I need, and where can I get a cheap (but reliable, of course) replacement?

Thanks
D