Just got back and Costco and the interstate GC2 batteries are on sale for $89.99 each with a $15.00 core charge. At that price they are the same as the Duracell GC2's.
The only problem i have with the interstate is that I havr not yet read a review where the battery has lasted longer than 14 months. Now, I realize that people do not usually post the good stuff but that many bad reviews maakes me a liitle worried. There is some speculation that INterstate may have switched mfg's and that is the reason for the bad life span of the battery. If anyone has any news or comments about this they would be appreciated.