https://store.arduino.cc/products/arduino-mega-2560-rev3
a breadboard
https://abra-electronics.com/boards/breadboards-wish/wbu-204...
lots of precut wires, some resistors, LEDs and about 20 74xx series chips...
https://en.wikipedia.org/wiki/List_of_7400-series_integrated...
I think you could do as well with
https://en.wikipedia.org/wiki/List_of_4000-series_integrated...
I think it's pretty fun to wire up circuits of logic chips and drive them with the Arduino.