Parts alone are worth that price. Without going through the pre-oiling procedure, damage can occur even rotating by hand. If it's been sitting for awhile then it is definately worth pre-oiling the system. Kinda why I mentioned about reading over some of the tech info in the sub forums. Probably have a Dana 44 rear end with drum brakes and a Dana 30 with drum brakes up front. And a Dana 20 transfer case. That is if it's a 4x4.
The regulator for the window is probably the culprit as to why it won't roll up or down. Rocker panels could be sourced through IHPA as mentioned before. If parts are not listed in the online store, give them a call. As they have many used parts that wouldn't be listed.