Is there a place in the Springs where I can just stop in and pick up a spring, or a pin?

Last night, I was assembling another lower, and shot the little brass take-down-pin pin across the room - never to be seen again.
I know I can order them on line, but I don't want to have to pay shipping for something so small, and I don't "need" any other parts at the moment to make it worth the cost.