I don't think that most Gunsmiths will have the bushings in stock, especially for the 10mm...while it can have some wear, I haven't seen one needing replacement of the bushing or the barrel for that matter. There is a nylon ring inside of the bushing itself.
If it were me I'd let S&W do the repairs, they will be able to serve you best and insure the gun is in perfect working order.
Recoil assembly...prices may be different today!
scematic part #60 - Factory Part #103200000 $10.66 X RECOIL SPRING GUIDE ASSY
scematic part #07 - Factory Part #105150000 $9.45 X BARREL BUSHING