There are web-based sellers with chinese knock-offs of turbos. These can be had for less than $200 new. I chose to go this way so that I could experiment with a cheap turbo, and once the application is working well and or the turbo itself fails, I can substitutue a more desireable turbo with little effort. The outfit I'm thinking of, called something like red-line max, does have quite a few smaller units.
