So are these an offshoot of the Savage Mondo Blitzers, Kenner, 1991, released as 4 packs in the States?
Ebay and Craigslist is probably your best bet if you're from the States, but also check eBay Italy and Greece as the line was released in these countries too, along with exclusives and variations.
Use 'Gli Skatenati' for Italy and 'Skateboard Mania' for Greece as these were the brand names there.
Good luck, and be sure to post some pics here if you find any
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