Wow, thats a lot of cabbage for a cut n balance on a driveshaft. Not trying to add insult to injury here but, my local place, "precision clutch and driveline" can do a shorten and rebalance for under $100 with tax as long as theres new joints already pressed in. I'm sure the shop you went to isnt the only game in town. You may need to shop around.
BTW i like your avatar. Did your kid draw that of you? My kids always seem to draw me with a straight across 5 o'clock shadow, and a yellow Jegs hat lol.