Organization is key to rebuilding a tranny. Price is something you'd have to look up. It depends on what is worn and what you lose when rebuilding it.
If you're doin it yourself I'd look in to getting the blocking rings and maybe the speed gears cryo-treated when they are out. At
Performance Cryogenics it is $8.00/lb. You could also do all the little needle bearings but I wouldn't bother with it. You'd probably lose most of them trying to get them done. The other bearings however may be worth cryo-treating.