It varies by club. You'd have to check with your region to find out for sure. Typically, the more days on your ticket, the more significant the discount - although the discount isn't that great. Sites like Undercover Tourist are slightly better.
This must be the rule of your club. At my club in Western NY, anyone can come in and buy tickets. If you are a AAA member, you get the discount. If you are not a member, you get the same price as Disney. No booking requirement. I bet your club loses out on ticket sales, though - I used to work at AAA here, and we had a lot of people buying tickets that were staying with relatives or off property.
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