What would be the best, most cost effective way to transport mountain bikes with my small car?

I do not have any sort of roof mount available, nor a hitch. I really do not want to make any holes or anything in the body of the car either. I have tried to fit my bike inside but it is just too big- and my sister and I have plans to go on a lot of trips this summer with our bikes. So a transportation method suitable for two would be ideal. Also something that isn’t going to cost me too much either:) Any suggestions?
My car is an ‘02 Toyota Corolla, if that helps.

By: apriljaymes

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Mountain Bike Reviews