Mapleshade makes a nice looking thin cable that is not very expensive. I think they have a website you can find. Some members here recommend their cables. For $3.99 x 2 (you need 2 colors to be safe), why don't you get 2 spools of the RS solid code hookup wire and lightly twist red and black together for pos and neg and try it. (You could do with one spool, but you have to cut the lengths first, mark them at each end and be very careful.) Black and white solid core Romex from the hardware store, lightly twisted again, also looks decent.