Have you guys seen these? Transformers Construct Bots are super cool! You build the robot (Like you would with k'nex or legos) and then the robot can transform into a car! This ulitmate set come with Optimus Prime and Megatron. Both my boys (6 and 3) love it! And so did my husband! We all (mostly mom!) love that the box it comes in is a resealable container so you can keep all the pieces together!
You can buy it wat Walmart for $29.96. Merry Christmas!