You can set a product to be excluded from receiving a member discount. There is a checkbox on the wine product page called 'No Member Quantity Discounts', and if selected, the regular member discount will not apply to the item for POS or online orders.
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NOTE: Regular volume discounts will still apply, unless you also select the 'No Volume Discounts, Coupons, or Sale Prices' box below.

For the 'No Volume Discounts, Coupons, or Sale Prices' check box option, note that, if selected, this product will not count toward volume discounts for other wines purchased. Shipping discounts will apply.