Well, there are far more knowledgeable folks on here for parts prices but for some parts, and a brief case this seems expensive - about $2500 after 30% buyers premium that this auction house charges,

Wonder if more people will put these together to sell.

https://www.invaluable.com/auction-lot/curta-demonstration-model-set-1994-1c74777b14

The cutaway ended up after premium being about $8500

https://www.invaluable.com/auction-lot/curta-type-i-cutaway-model-1948-1b74b8199e