Find a new tranny, and put it in yourself. It sounds like a daunting task, but once your down there, and see how easy it is to "drop the tranny," youl realize most transmission places rip you off. Now this is mostly a RWD only thing, FWD trannys are hard, but I think its something like 10 or 14 bolts total and you can have the tranny sitting next to the car and not in it.

 

First find out where its leaking lol this will require you to actually look under the car... I know thats a lot of work for kids these daysbut you can do it I have faith! lol j/k.Don't just give up and say o well. Its probably is just a line because I have never seen a transmission seal leak bad enough that it leaks out the fluid as fast as you put it in..... Now a transmission line thats different.