Over the last two years I've been buying batteries for my sight lights, Afterburner, Copper John, Viper--etc, anywhere from $1.50 ~ $4. 95 for 'each battery'.
Recently, I found out that the $ Store has batteries that are working just as good in all of the lights mentioned above, pack of 5 and packs of 10--for $1.00 + the taxes.
For my fellow buddies in Ontario--take advantage of this, the batteries are working just as good.