For LEGO fans, I think that this Lego Block Calculator is another cool Lego based gadget that you should keep right now. The idea of this calculator is to turn all of the LEGO 'buttons' into the calculator buttons. It’s a Lego, it’s a calculator, it's all kinds of fun. It comes in four colors, red, blue, green and black. Not sure if you can actually connect your Lego pieces to this though and get creative. The building block calculator will be available in August, but you can pre-order it now for $27.