This Märklin Collector's Set was only available at the Porsche Museum in 1992.
Every now and then you see one coming up for sale on eBay, but hardly one is as complete as this one.
Beside all 4 cars in mint condition it also comes with the bright yellow transparent plastic as well as the Certificate from Märklin.
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USD 75.00 + shipping
I have a 2nd set without the small damage of the yellow transparent plastic.
That would be - of course - a little more expensive:
USD 105.00 + shipping
PayPal only
if you take more scale models, I will give discount - and you could save on shipping costs