There is a community of folks who are really into this firmware, and a lot of those people buy SwissMicros other models of calculators, (e.g. DM42 or DM32) and put keyboard stickers on it. This allows them to buy the model with the correct key legends up front.
The low volume and the relatively high build quality involved pushes the prices up.
The low volume and the relatively high build quality involved pushes the prices up.