Most square body Jeep Cherokees up to '96 have 3.55 gears. Try automatic V6 Dakotas and Dodge vans . The '97 and up models have increased spline count.
New gears? I was just in a Year One catolog and seen Motive gears for $219, $10 cheaper than Mancini racing. Double check shipping from both places, ya know what I mean.
Randy's Ring and Pinion will have the gears. You'll also need at least a new crush washer. If you're going to install it yourself, no worries. Some shops, however, will not install customer supplied parts and warrant the work.