When it comes to pressing buttons, nothing beats the sweet tactile feedback a computer keyboard can provide. Now you can experience the same joy whist crunching numbers on the go. As you can see, the Takumi calculator features a computer style keypad, but it is also interesting to note that it can connect to your PC via USB and function as a traditional numerical keypad —which could be extremely useful to laptop owners. Available for around $46 [Product site via TFTS]
There is another similar product thats the other way around, with a numpad being its main function and the calculator being secondary, I think by kensington. All I know is I saw it on here a while back, told my mom about it, and she fell absolutely in love with it, so it must be a decent product.