the toe and camber settings in back strongly affect one another. until you get new toe links, set your current toe links to max toe out. then, adjust your camber until the toe zeroes.
as for a permanent solution, you'll need aftermarket toe links. they're available from Tarrett Engineering and also from Che at Delubozparts (ebay). Che's are fairly affordable (see here:
http://cgi.ebay.com/ebaymotors/Porsche-986-Boxster-97-05-Adjustable-Rear-Toe-Arms_W0QQcmdZViewItemQQcategoryZ33583QQihZ020QQite mZ300154881897QQrdZ1QQsspagenameZWD1VQQtrksidZp163 8Q2em118Q2el1247)
no matter what you go with, it's a good investment to buy the concentric bolt locks from Tarrett. the concentric toe adjusting bolt has a tendency to move; these hold them in place so they don't move when you drive. they'll also prevent an alignment shop from using the concentrics to adjust toe rather than the double adjusters on the aftermarket links.