THE least expensive ...

[rubbersidedown]

A powercommander 2 is all I need (I believe) for a y2k 'Busa.
The cheapest deal is

 

[Mr. Busa]

check out parts411.com they usually have great deals there and while your at it pick up one for me too.

 

[ks-waterbug]

My loss could be your gain........
Just bought a Powercommander II about one month ago!
Got almost $285 in the whole package (also have the 9 volt adapter) would take $250 for everything. Still have the registration card.............