If anyone's interested in buying mine, I've got my replacement GBS-100 going on eBay here.
http://cgi.ebay.com/ws/eBayISAPI.dll...MESE:IT&ih=002
The one it replaced was only doing about 30mW but this one seems (my meter only does 60mW) to be putting out over 80mW, accounting for enough divergence that my meter doesn't top out.