Hi Dale
Niagara
http://www.niagaraairparts.com/ may have a rebuit but they know what the market is doing out there so be prepared for a shock. I think one of the members here on the board just did the big exchange and it was around $4-5k. I know the shop I work with just replaced the rear on a P model and it was in that neighborhood also. The P model uses a little different unit as it has the turbo scavenge pump involved so the price above reflects that. I bought one for my normal aspirated from AERO
http://aeroinstock.com/starter-adapt...772.1448027274 about 4 years ago and it was in the $2k range. The reason I went with AERO vs Niagara was that AERO would give me 100% core value where Niagara will nick you for damaged parts or non-rebuildable issues. AERO was no questions asked just sent me the core value back. Good Luck