I’m delighted to confirm that we’ve been able to add this feature now. You should see an option to download price books from within the price books area of Breww. You can download multiple price books at once and choose how to format the file (if including multiple price books).
We hope this proves useful and thank you to everyone who voted. There was mention above of importing too, which has it’s own thread that should be voted for if you’d like to bulk import price updates. Please see Data upload price books (import prices from a spreadsheet).
P.S. @luisa-guerrera I know you were looking for this, so I’m tagging you to ensure you see this 