I purchased them from Honda East Toledo in Ohio, USA on 19/8/2011 and they cost $170.99 delivered to me in Tasmania. I just checked their web site and they're still available, cost is now $$175.00 + shipping $79.00. They've gone up a little in price since I brought them, but with the dollar value I guess that's to be expected. Like all Honda products the quality is excellent! 
Hi Couch, I checked the Honda East Toledo web site and it says that 08T50-MCS-100 Heated Grips (with Thermostat) are not available.
I ordered OEM heated grips 08V70-MCS-100 for my 2012 ST1300 from MRCycles in North Carolina in July 2013 - shown as available on their web site. After two months of not being shipped due to non-availability got my money back.
After much searching, I have not been able to find OEM heated grips anywhere! Most sites now say obsolete or not available - not sure why they continue to show them on their web sites?
Can you please confirm the link to the Honda East Toledo web page showing them as available.
Many thanks,
Marty