Rarely has a design changed the Makerspace like the Arduino. You can find them just about anywhere, with varying prices from less than 10\euro all the way to over 100\euro for the most advanced models. One of the major strong points for Arduino has been the shield support, a unified header system that allows people to buy existing shields to add functionality, or for the more adventurous to design their own. You can find shields for prototyping, motor control, 110/220V relays, LCD segment screens... Just about anything, really. And yes, you can also buy shields with TFT displays.