I went looking for a Honda Fit spare today at the local scrap yard, and found one. The yard let it go for $4.50 CAD with a jack! I walked away a happy man.
When I got home, however, I noticed that the tire size was 115/70D14, not the 135/80D15 that others had mentioned in this forum. 135/80D15 is supposed to be a good drop-in with the stock tire sizes. I thought that the tire I picked up seemed a bit small, and it was. Fortunately, it was nearly free.
Just for kicks, I tried it on my car (both front and rear). With the minor clearancing I had already done on the front struts, it fit with no problem. I expected when I drove the car that I would get the RBS, TCS, and ABS lights - sure enough they came ON. But for a car with 100km of range, meaning I'll be almost always within 50 km of home, it will work to get me home. I've never been a fan of tire goo and am much more comfortable having a spare tire.
I like that the wheel is quite compact. It fits quite nicely on the rear cargo deck lying flat behind the seats. I will be welding some nuts to the motor compartment lid so that I have a way to hold it down securely. The jack and tools will fit nicely inside.