[Mark from Sparkability just mentioned this in the Rocking Chicken comments:]
Playsam designer Ulf Hanses, who created the company's Rocking Chicken and Horse--as well as their signature Streamliner Classic car, for that matter--also created this incredible Rocking Car in 2001. It's based on Sixten Sason's original prototype for the Saab, which Hanses calls "one of the most modern and futuristic car models of its time."
Playsam has designed many objects and promotional items in collaboration with Saab, and the Rocking Car (and the 2002 Roadster), were among those that made it into production. Like all good Saabs, of course, it's gone now. Somehow I can't see GM--which took over Saab and turned it into a pathetic, soulless zombie brand in less than five years--commissioning anything like this anytime soon.
But if you HAVE to HAVE a Rocking Saab, even though you'd never even heard of it until five minutes ago, Jack Box, an online toy store in Japan, may be your best bet. They list the car for around 59,000 yen, but they say they got some, they're taking reservations, but delivery'll take 2-3 months. I've fired off an email asking for details, so gentlemen, start your engines, but cool your jets.
Scandinavian design on demand [playsam.com]
No.14003, SAAB Rocking Car, Black, 58,590 (tax incl.) [Jackbox, mayg.co.jp]
Related: Another Playsam design you can't have, the Police Harley Davidson by BJ÷RN DAHLSTR÷M [playsam gallery]
Previously [hmm, sounds familiar]: Awesome Wooden Swedish Car From Playsam