The rear shaft seal is pretty easy, but you can tell if it is leaking by looking. If you have the right puller, you can get that seal out in a few minutes and tap a new one back into place. Id estimate $50 or maybe somewhat more, unless you go to a dealership where they charge high and have generous flatrates.
The pan gasket and filter... About $75 -90 at a typical independent shop, according to my last estimate. More if you let them suck out all the old tranny fluid with their sucko machine and replace all the fluid. You could do it yourself for about $25 for the filter and gasked, and maybe $15-20 worth of tranny fluid.
Front seal. Depends. Hard to get to, they have to drop the tranny. If they can pully the tranny body without having to take off the bellhousing, it is an easier job. On some cars and trannies you can do this, on others you cant. Without checking flatrate times or parts costs, I would estimate $150-350.
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