Pick up a copy of Excellence magazine at a good book store. it's a Porsche particular magazine and the Oct 2006 issue which is out now has a nice article on the Boxster starting on page 123. There are tons of ads from businesses and dealerships, many of which can sell you a hardtop.
There are many online forums for Porsche fans, as well as Boxster particular forums. One of the people there can be selling a hardtop now. Do a Google search on "Boxster forum".
I assume you're talking about the Porsche Boxster ?
Anyone who really has a Porsche should know how to spell the name right.
Look on a car sales web site, it is really pretty easy. You use Google to find the web site then you put in what your looking for on that website's search feature.
I own a Porsche and are intrested in purchasing a older boxster. but they way to get one is Porsche will yes WILL send you the roof for your car they still produce all porsche part for 356 till now. just go to the dealership and they'll put a oreder and in about one week it should get there but since it's a big package more like two 3.
Easiest place could be a dealership, but that's most likely the most costly also. you may be able to pick them up all over the place ebay or any other classified advertisement paper . Used they're typically around $1500. If you may be able to get a great price on one, but it isn't the right color, you may be able to generally have it painted to go with.