Take 90 to the Marengo exit which is route 20. Make a left. After that go down about 5 minutes till you see a place on the right called wild west town. The place looks like a strip mall, but its all one place. Make a right at the street before WWT. The name of the street is South Union. After that, you will see the shop (beige with a green roof) on the right about a minute or 2 after you turn.
HTHs