eBay is your best bet. Just go to the die-cast subsection of toys and hobbies and search for Boxsters. Some of them can be quite expensive- two of the larger ones in this picture could get ~$40 each, and for good reason- so be ready for some sticker shock. Some of the others are not nearly as bad though.
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2002 Boxster 2.7
2008 Navigator L
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