3 yr old this year and while being rather spendy we have loved it. Everything is included - open and go. My son loves doing 'school'. Before bed he always asks what we are going to learn about tomorrow :-)
http://www.sjscycles.co.uk/product.asp?pf_id=12571&src=froogleUS¤cy=USD
You'll have to let me know how you like it. It would be great for my 3 year old.