Hi Nancy - Thanks for the welcome, not new though... just a new user name.
The Signature Beverage Package if bought prior to sailing is $44.95 per day.
If bought onboard it is $54.95 per day. When I quickly grabbed the price late last night I took the total from my cart and erroneously added tax on it a second time based on the verbiage but did not go through the checkout process to verify.
Pre-Paid = $689.52 including gratuity
Bought onboard = $842.93 including gratuity
That brings my per person savings to either $517.52 if pre-buy or $641.63 if onboard. Still worth it for us.