KabelDirekt Pro Series 3.5mm Audio Aux Cables: 6ft for $1.50, 3ft for $1.30, 1ft for $1.20 AC + Free Prime Shipping

via Amazon, sold by KabelDirekt Products
Clip the 80% off Coupon found on the listing (single-use only).
Available Sizes (prices are after the 80% off coupon):

• 6-foot $1.50
• 3-foot $1.30
• 1-foot $1.20