How about new? Vertex Auto has a Sachs clutch kit for $399, or Power Friction for $379.
http://www.****************************************.com/SubCategory/Transmission%20and%20Clutch/Clutch%20Kits.aspx
$3K to install a clutch kit seems very high. I received a quote for installing a clutch kit, along with an LN IMS retrofit kit, for a LOT less than that...