No parts - just labour. We did it ourselves and it took probably 4 - 5 hours to strip, clean and reassemble. Probably take 2 - 3 hours now that we have done it once.
The good news though is having done it once, Next time I would do the following instead of a full strip down
1) remove the belt and try rotating the supercharger (SC) by hand. It may take a bit of effort, but should be smooth rather than 'sticky'
2) if it is 'sticky', remove the SC from the engine (a few bolts and some clamps)
3) spray brake cleaner or similar into the top of the SC and start rotating it
4) keep spraying and rotating until it is no longer sticky and the stuff running out the bottom looks clean
5) let it sit for a few hours to make sure no brake cleaner remains in the system
6) change the SC oil
7) refit to engine
Our one was actually frozen solid after the boat hadn't been run for a few weeks so we assumed something had seized (bearings etc). In fact it was just the sticky residue on the vanes sticking them together. We stripped it right down and checked bearings etc but in the end it was just the sticky gunk that was the problem. Having seen how it all works we decided that if the other engine did the same we would use brake clean etc as above. If you do strip it down, take careful note of how the gears of the vanes engage (take photos and put marks on the gears etc). We probably spent 1 - 2 hours getting the vane timings right again as we weren't careful enough when taking it apart.
You could probably get away with a quick and simple solution if yours isn't seized by disconnecting the inlet and outlet hoses to the SC while still on the engine and spraying the brake clean through it with the engine running and the SC turning. Just need to make sure that the engine is not sucking the brake clean into the intake as it comes out of the SC outlet.