Please be sure to check with your attorney to make sure you can offer to include shipping fees. If so, you want to do a promotion, here's the trick:
Ecommerce > Settings > Wine and scroll down to the Shipping section. There are 2 options:
1 Include shipping on orders over: $
2 Include shipping on #items in cart #
Please go ahead and try this out before you send out any campaign. Note, Items that are set up to have special shipping may not be included.