try ebay most of the time there is one or more for sale. the Bis is more practical as it has a usable boot, the aircooled has an engine where the boot should be, the front luggage area is rather limited but you can get some stuff in there. you can put the back seat down to carry stuff in the back, but if you need to carry some little humans this is not an option, big humans are a very tight fit, but can be accomadated as a squeeze.