https://tools.woot.com/offers/maxxhaul-4pin-flat-trailer-wiring-harness-kit-18ga?ref=mwj_cd_deal_9 MaxxHaul 25' Male & 4' Female 18-Gauge 100% Copper Wire Harness Kit for Trailers (50342) for $3.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.