Keep watching the 1/16 on eBay. $80 is ridiculous, but up to $65 with shipping is reasonable. Bookmark this -- you'll find a Buy It Now for $49.95. Same kit boxed under many different labels.
http://www.ebay.com/sch/i.html?_odkw=1%2F16&_sop=10&_osacat=2580&_from=R10&_pcats=1188%2C220&_armrs=1&_trksid=p2045573.m570.l1313.TR0.TRC0&_nkw=1%2F16+mercedes+ss&_sacat=2580
By the way, the late Martin Swire was working on turning that kit into an SSK by shortening the chassis. It was his last work, and here's where he was at the time.