What cable

So I recently switched from cox contour to basic cable and when I switched they asked me to bring in all of the equipment they had given me. I returned the cable box, remote, and the cable that connects the cable box to the wall outlet. In return cox gave me a box containing their mini box, which I was told had everything I needed. After getting home we discovered we in fact still needed the cable that connects to the wall. Cox isn't open tomorrow and we plan on watching the Super Bowl. I looked online at Walmart to see if they sold these cables and it appears they sell a couple different ones, I was wondering if anyone knew the specific type of cable I should buy?