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Don't start your car and try to drive it again. The transmission may be fine once you repair the leak (probably a broXXXXX XXXXXne) and top the fluid off.
Well nothing is cheap as I'm sure you are aware of. But compared to transmission replacement, yes this will be a cheap repair (around a $100, contingent on the labor rate in your area). There is also the additional cost of the tow truck, if you have AAA travel service they will cover the tow. Also your insurance policy may cover the tow, contact your insurance agent or review your policy.