Newegg has these 15' HDMI cables for 70% off after adding promo code CTHAMXE8899.
Coboc EA-HDAC-15-BK 15 ft. Black HDMI A Male to A Male 28AWG High Speed HDMI w/Ethernet Certified Cable w/Ferrite Cores Male to Male
One comes to $2.40. If you add 2 or more, it drops the price of each HDMI cable to $1.85 not including tax. Shipping is free.
Examples, 2 for $4.06 shipped including NY tax. I bought 3 for $6.08 shipped.