A4C via eBay offers the Chromo 5-Foot Auxiliary Cable 2-Pack in seven colors for $2.86. Better yet, add three to your cart and the price drops to $4.29. With free shipping, that's $1.43 per set and the lowest total price we could find for this quantity by $11. Each cable is compatible with any 3.5mm input and includes one L-shaped plug and one straight plug.