^ Gift certificates are not allowed I don't think. Alcohol & food, yes, but only if they're under a reasonable limit. In other words, no Opus One or Dom, please. And if you're asking what's reasonable, then whatever you had in mind is too much.
Just want to state that I think it is always best to contact the store in advance if you are thinking of sending something which may be "unacceptable or out of policy" so as to avoid any misconceptions/akwardness....JMO