Here's another option for US members.
http://www.radioshack.com/product/index.jsp?productId=11909407Back ordered at this moment .
I've seen them at Radio Shack for $45, so keep an eye on this site .
Usually free shipping .
I don't know if they deliver to your home, or nearest Radio Shack store .
May, or may not be a better deal than Gruber, you'll have to decide that for yourself .
Gruber is local for me, so I just get the batteries from them .
All of my bikes have them .
I have them delivered to my work place and I get whole sale cost $21 each .
With the short service life of batteries here in the desert, I won't pay anymore for a battery, they seem to last the same amount of time, no matter which one you get .