btw- if you have basic hand tools and a jack, you can change them in 30-45 minutes... They're not difficult at all... Save that shop money!
As an aside, I know from experience of myself and people around here I know that have swapped with normal stock Ex's, the Timken bearings are the best, followed by BCA. The Autozone Chinese ones, Advance Chinese ones, eBay 2-for-$70 specials and NAPA's WB's have the worst track records, at least in my experience, and that's of about 10-11 replacements I know of locally...