http://adtr.net/sunshop/index.php?l=...t_detail&p=149
It's $300 from ADTR, a one man operation in California. I've bought most of my aftermarket parts from him and he's very helpful.
The instructions for the PI swap are
here. Only note is that instead of using the NPI gaskets, you will be supplied with the PI gaskets which only require RTV to be placed in the two coolant ports instead of the 8 intake ports. Most people who have done this go with the PI gaskets, including myself.
You don't even need to disconnect the fuel lines if you don't want to. I just left the fuel rail attached to the fuel lines and twisted it over to the passenger side of the engine compartment out of the way.