I'm also wondering the same thing - I've done searches and haven't found too much. I comparison shopped (we're looking for 10 day, hopper, water park tickets for 5 adults). Checked the Disney site itself, called
AAA, tried the "supercheap" link through Mousesavers,
Undercover Tourist, the links on the main page of this site, and a couple other sites I visit, and they're all within $15 total ($1565 down to $1550).
For that, I'm planning to go with AAA because at least that way I know I get the parking pass. For the number of days we'll be going and staying offsite, I think the convenience is worth it unless anyone has any places to purchase that offer a more significant difference. I keep reading people saying they saved like 3 or 400 dollars through some site, but think they must be comparing to gate prices, not the Disney multiday advance purchase site.
Anyone have anywhere better? Would you jump on them now for a trip next summer or is there any reason to wait? Can't believe they'd go down!