If, after uploading a product block, the prices have changed in your web shop, it would be nice if you could change these manually. In the editor of the Messages module, you can change the 'before price' by clicking on the drop-down menu next to a product block, and then on Change text.
A pop-up will appear where you enter the price in cents. It is also possible to change the product name and description here. The changes only apply to your newsletter and not to your webshop.
Click on Ok and the product block has been changed to your newsletter.