Toy Story 3 Action Figure, the link is for Buttercup but there are a few others on there, this is the cheapest I can find anywhere with the next being play.com for £7.49.
Handy if buying other things or if you have a store close :)
Collect these 6" Toy Story characters! Featuring Buzz, Woody and Jessie and many more, each action figure is fully articulated. Recreate your favourite Toy Story movie scenes and make up new adventures!