Well, they probably carry it there ... I know that O'Reily carries it, but I always buy mine at Advance Auto Parts, since it's just up the street from me and I get an employee discount.
Another thing you can use to help clean up around solder joints ... rubbing alcohol or acetone to dissolve solidified resin and flux. Plus, one more quick electronics tip from an old electronics guru ... clean your copper and brass before soldering by hitting it with some rubber erasers - that's right, the back end of an ordinary pencil works great! Clean the rubber residue away with rubbing alcohol and then solder away!
I also get my Turtle Wax there too ... I get the Hard Surface stuff that's liquid rather than paste form. It just seems to go on easier for me.
Oh, as a quick aside ...
One-Step pen polish, sold by Penn State Industries ... happens to utilize a variable grit that breaks down during use, going from about 4000 grit all the way up to a 30,000 grit polish pretty quickly. I was surprised to find out that Meguair's also makes One-Step. They use the EXACT same grit formulation for Plast-X, but you get nearly twice as much in the bottle for less, getting the Plast-X, and you haven't got to worry about shipping either!