You can obtain Christmas themed rubber stamps at most major craft stores, like Michaels. There are also some great places online for this. addictedtorubberstamps.com is a good one. If there's a Stamp Barn near you, they're a good place to go. Stampin.com is wonderful, as is stampandgo.com.
Hope this helps :)
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Do a Google search for rubber stamps Christmas theme set or something like that. I'm sure there are tons online. Also agree with Ladyface.. I'm sure Michaels and Hobby Lobby and other specialty stamp stores will have a variety for Christmas as well.
wishing you luck.. I'm sure what you are looking for won't be hard to find :o)