PX625A 1.5V Alkaline Battery
If you don't wish to buy/use a Weincell because of their short life span, then this is an alternative to the discontinued 1.35v mercury battery for vintage film cameras that requires PX625 batteries.
Price is for One 1.5v PX625A Alkaline battery. Just compensate by iso for the difference in voltage, like I'm doing for my Rollei XF without any issue, usually you don't even need to compensate at all.
Inclusive of local postage.