Like bbird said, depending on the type of tire you're running on your bike and where in the country you are, you'll probably have to order a tire and wait 2 days to get it installed.
Then, you'll probably pay a shop minimum of $50 or something silly to get it installed.
I ran into this last year in South Dakota. My rear was safe, but getting down there, so I thought I'd try to get a new one while I was at a "major" Honda delarship. But, seeing as 99 out of 100 riders in the area ride cruisers, nobody had a sport-touring tire I could mount. But I could wait two days and then pay something like $65 to have it installed.
So, I just rode the 2500 miles home and the tire held up fine and I had a new one put on at my local dealership for $10