I believe Micky Hades in Canada has the full sized plans for both of those popular kiddie bits. . . not the little ones but the full stage size which are more than two feet tall (I think the bunnies are close to 30")Kirkham has a set he made with a Christmas theme that I absolutely loved, but the Dragon idea could prove a big hit. Oh!

The covers for the Dragons should be Shield belonging to a Knight or small Castles. . .
I'm thinking you could have some fun with a Dragon Egg as well . . . a variant to the old Ball & Vase (very period, btw) but using a large egg. . . I'd couple it with an actual Egg Bag routine, to make it more unique.
If you have a cooperative wench available, you might look at doing the old Vanishing Garter Strap. . . it's period, funny and more adult but clean enough for a family group. While costly, another "illusion" that would work is the Cross Bow version of shooting a ribbon through a lady. . . they are very rare; I believe Stienmeyer has an up-dated variation to it but know for fact that Owens Magic has made a few over the years. . . I don't believe they've hit that $10,000.00 + price range but probably will be close to $8k. It will certainly prove an excellent PR bit however.
If you haven't yet done so, look up Bill Palmer, he made a career of Ren Fair Wizardry here in the States and I believe Germany as well. I'm certain he would have more than a few ideas for you and might even have some inventory he'd consider selling to the right person. He used to be a moderator at the Cafe but you can reach him here
http://www.billpalmer.com/ -- tell him I sent you his way.