An alternative to the Wein cells are zinc/air hearing aid cells - after all the Wein cell is just a modified version of these, coming with less pinholes and an adapter to make up the size.

A blister of 6 cells costs me 2EUR and each cell is good for 2 - 6 months of usage.

OTOH - with cameras w/o that bridge circuit you can make use of the exposure latitude of negatives films... wouldn´t mind the minimum exposure shift with a P&S camera.