2000 Camaro front seal leak

Hey, Im possibly buying a 2000 Camaro base coupe with a 3.8 L V6 when I turn 16. The car is about 250 miles away, so I have not been able to personally see it. However, we had an unbiased mechanic go down and look at the car to give us a report. He said that the pinion seal was leaking and that there was a front transmission seal that was leaking as well. (7 year old car with only 46k miles, possibly sitting for a while and could have dried up the seals)

The dealer fixed the pinion seal but they said it would be too costly a job to fix the front one, and insisted that it was just small seepage. We are currently waiting to hear back from the outside mechanic on whether he thinks the front seal could be a serious problem. My dad said its a job where the parts only cost about 20 bucks, but the transmission would have to be removed from the car and taken apart to fix the seal, and if they cant fix it for us, then we can not buy the car because it would be too expensive a job to replace and another car would be cheaper.

I would like to know if anyone else has had a problem like this and the price range that would expect to be paid, or possibly if the part can be replaced an easier way.

Thanks

P.S. - Would donate but Im trying to pay for a car, I also don't know much about you guys or if Ill even get a response, and Im not into just giving money away. Sorry.