when the batteries arrive in a couple of weeks, I'll let everyone know. There is no sign-up sheet, they will be available on a first-come-first-serve basis. If demand is still high after the first 100 are sold, then I will order another 100. Keep in mind, since the distributor will only obtain them on a per order basis, and that 100 units is the minimum order to have them sent from overseas, I will have 100 in stock once every 30 days. So just keep an eye on this thread and be one of the first when they arrive.