You can get this Pop-In-Kins Elf Fun plus Christopher Book Set for $15.70. I will have lots of Elf on the Shelf ideas for this holiday season but I wanted to mention this alternative to Elf on the Shelf.
This is an excellent price and half off what the regular Elf on the Shelf costs. The cheapest I have posted this set was $12 and that was a few days before Christmas 2011!
This is a really fun holiday tradition that you can use year after year.
Please note that prices on Amazon can change at any time.