We just bought 6 day Hopper Plus tickets thru AAA at prices that I think are better than (or at least as good as) the DC discount -- $278.96 for adults and $210 for children. Both prices INCLUDE tax. (Since we already are AAA members and managed to get a resort discount using a code from Mary Waring's site (yahoo!), there wouldn't be any cost-saving for us to buy the DC card and get that ticket discount.)