To answer the question directly;

Where to get a 46mm camera...

There have been Camerz ones on eBay with no bids in the $100 range + $35 shipping.

I think Camerz Z1 (early) had a Schneider lens. Later ones had something Japanese.

These cameras came with I think 4 different film mag options (2 @ 35 mm, 2 @ 46 mm) so make sure it's what you want.