At a minimum try the Volex 17604 at around $12. The Iron Lung Jellyfish at $29 is also well respected as an effective low cost cord. If you want higher quality, then Mitch2's DIY suggestion is the way to go. Great bulk cables will run $10 to $30 a foot. High quality connectors can be as cheap as $10 or as expensive as $250. It's a very easy construction project.
