I got a Cricut Expression machine for Christmas. It's been fun to mess around with, although the office is such a post-Christmas mess that I'm not really full-on crafting again yet.
I will say, though, that the cartridges seem to be worth the price. I was skeptical, but they have a lot of flexibility and creative potential.
I bought mine from a website called CustomCrops. Their prices were close to half off retail and they've had good customer service and decently fast shipping on the orders I've placed.
I did cut out a few "Thank You" phrases and snowflakes and let the kids decorate their own Thank You cards for their Christmas presents. That made for a fun and really chaotic afternoon.