If it's a Zeintec style you want look at this thread. Price for their artic silver demo top is $3k. Regular Boxster hard tops can be had for a lot less than that.
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2003 Boxster - Sold but not forgotten
E- bay is a good source...they usually go for about 1500. The problem is that most sellers don't want to ship. Take your time and try to find one somewhat local.
Cheers