Oboy! I get to help! All right, the best place is the Mod The Sims site where I found a nice amount of Disney Princesses and related made by denise_316 especially (the link to her page directly is
http://www.modthesims.info/member.php?u=165440).
There's also the WickedSims2 Forum page at
www.wickedsims2.com/forums/ with some alternative Disney Sims by Jessica. However, to join up you'd have to have an email service they'll actually send a confirmation email so your membership will be approved-for some reason they won't send to AOL or Yahoo accounts. I believe I tried a GMail account, or maybe a Hotmail one, to receive the confirmation email to become a member of WickedSims2.
I wish I knew if someone has actually done the Ducks-they'd be so cool running around Pleasantville...
Oh! And don't forget to check the exchange at the main Sims 2 site at thesims2.ea.com. I think that's where I found my Evil Queen.