Is it really just for a test fit? If so, you should be able to find a set MUCH cheaper than that...Remember, for a test fit, you simply need them to hold air. Most folks discard these tires after a specific amount of runs. If you have a local swap meet, or a local race track, you should be able to talk someone out of a used set really easily.
Once you are sure that everything fits, you can bite the bullet and purchase a new set.
Just my $.02.
Thank You!
OldMoparsRule!