Does anybody know of an app similar to Multipacks but with a price auto-update feature?  If the core product price is updated the multipack should calculate and update the price for the bundle as well. Thank you

Well, this is exactly what we are doing. It's faster to do the adjustment to accounting software than to expect Shopify to solve this issue anytime soon :))

You can use the Address2 field for VAT number input. Just make sure to translate the theme language string to say what makes sense from your customer's point of view. EU buyers already know that they need to input the VAT number so they are looking f...