Try Vampire Wire for a coupler. I have no first-hand experience, but I imagine in might be a step-up from Rat Shack.
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Radio Shack has a variety of couplers like this http://www.radioshack.com/product/index.jsp?productId=2102696&cp=&sr=1&origkw=rca+coupler&kw=rca+coupler&parentPage=search |