Whats my cheapest alternative

Flashing/blinking lights get on my nerves after some time. Best example it the Christmas tree. After a day or 3 I'll set it to basic on or off operation. So if these traffic lights were mine, all 3 lamps on or off at all times. And I would graft in LEDs so I don't need to buy/change bulbs often. Lots of potential candidates at Lowes, etc.., that do plug in at household 120 outlets.