I got my Unorthodox Racing undercrank pulley 91-94 1.6L for $160 from stillen last week.
http://www.stillen.com With s/h it came out to be $170. I called them up and the salesperson said it was on sale. For some reason though I have this nagging feeling that I could have haggled for another 10 or so off. Oh, they only have that model in black if that matters to you.
Oh well. I dunno about automatic installation. Mine is a manual and was awfully easy following the directions on the project 200sx page.
http://www.nissanperformancemag.com/january02/ur.shtml
The UR documentation says that you should follow a repair manual on how to get the crank pulley off on an automatic.
Here's a little documentation of what I did:
http://68.50.211.93/undercrankpulley/
Sean...