In Toy Story 2, Woody is a highly valuable collectible but in Toy Story 3 this isn't true any more. We know Andy has The Internet on his room, so he could have easily checked for his toys' prices but it seems that they have no monetary value in Toy Story 3. For example, in a scene when Andy is packing his stuff before going to college, Ham says he is going to check the toy's value on eBay in a tone that indirectly says "we are worthless".
In another scene, Andy says they are just "trash" and at the end of the movie, Andy gives Woody to the little girl purely based on their emotional value.
So what happened between Toy Story 2 and Toy Story 3 to turn Woody from a "collector's item" into mere "trash"?