It ain't cheap, but it's the first one I've seen on Ebay in two years...
http://cgi.ebay.com/ebaymotors/PORSCHE-SYSTEM-TESTER-2_W0QQitemZ4596427621QQcategoryZ43989QQrdZ1QQcmdZV iewItem
Never wonder why your mechanic charges so much to work on your boxster. This all-important tool alone is $4,000 in good, used condition!