I'm guessing just a ploy to get you to click on the ad.
In my search, I did find "Save Lilo and Stitch" website.
They are trying to save the show so it doesn't go off the air.
Quote by Al:
To that end I'd like the Internet community to join me in reminding the Disney company that "it all started with Walt." As you can see below we've created some T-shirts, plus a few simple graphics that you can copy and paste into your websites to let folks know how you feel.
A stitch in time saves nine is referencing the idea that doing/repairing something immediately will save you time in the future. Using clothing for example: fixing a small tear immediately will save you from a major patch job.
Relating this to the disney banners, I would conclude that they are saying "take advantage of our savings deals now because it will only be more expensive in the future". Rather any interesting marketing campaign. Implying a future price increase to motivate people into taking an immediate vacation.