If you need an adapter to convert #675 hearing aid batteries (zinc-air cells) into a clone of the PX-13/PX-625 mercury cell, please contact me at jon_goodman@yahoo.com. The adapters are still $14 each (which includes the cost of postage to anywhere and a lifetime guarantee). You'll save a lot in comparison to the Wein cell, as the hearing aid batteries can usually be found on sale for less than $1 each. If curious, you can see the adapter at my friend Rick Oleson's page: http://rick_oleson.tripod.com/index-111.html
Jon