when we used AAA to book our cruise we didn't get a discount but we did get a free upgrade (1 floor higher and closer to the center of ship, there was a bar steps from our room door which was great/convienent). They also left a gift basket in our room with some fruits/candies which was a nice surprise (not sure if all TA's do that tho).

(sorry, didn't mean to respond to you snorkler but to the OP)