Until 5 pm ET (or 100% claimed), Amazon offers Prime members the Animal Planet Hatch 'Ems Sea Creatures (Series 2) for $8.99 with free shipping. (Non-members can spend over $25 for free shipping; otherwise, shipping adds $6.06.) That's $3 off and the lowest total price we could find. It includes three eggs containing either a shark, turtle, or blue crab.
It's guaranteed for Christmas delivery via Prime 2-day shipping.