1) Salvage yard, particulary Pick-n-Pull places
2) Contact Aaron, aka "speedy300Dturbo"... he has had them for sale in the past.
3) Jim Friesen sells seal kits to fix your leaky ALDA, and has sold "rebuilt" ones in the past for pretty cheap.
4) Like FI said, you can't buy one from the dealer. But you could get one from a Bosch shop. I wouldn't want to pay for a new one - not worth it.
