Re: Calico critters
I looked at the Kidkraft ones too but I the scale being off really bugged me. I also didn't like the way the 'style' wasn't really calico critters.
Since you potentially have a free one, and he is 3 ( so won't know the difference ) I would totally use that. Paint it or clean it and then you'll be able to afford more 'stuff'. If it turns into a massively huge hit you can spend the big bucks later on the fancy house for his birthday or something!