$250 Fixed isn't bad, but you can buy the parts and do it yourself for cheaper. As long as the cardan yoke (H yoke) is in good shape, you can just buy the ball seat repair kit for probably around $40-60, or if you have a garage account likely cheaper. The u-joints that go to this set up are not much more than any other joint. Anypalce like advance auto maybe napa can get the ball kit and joints.
Neapco part # 7-0081NG (ball kit)
joint part # 269 (your local parts store should be able to cross reference)
If the H yoke is needed, an ACDelco jobber could order it, part# 45U0836 or if all else fails a GM dealer can order it under part # 89029404 , it lists for $60.
The purpose for that set up is to compensate for the odd angle of the t-c yoke vs the axle, to eliminate or at least reduce as much as possible driveline vibes. Guys with big lifts also run one on the rear driveshaft too.