8/3 UF/B (Underground Feeder - Direct Earth Burial) Cable: Amazon.com: Tools & Home Improvement
8/3 Gauge SOOW Cable 50 Feet - Walmart.com
Southwire 125-ft 8 / 3 Stranded UF Wire (By-the-roll) in the UF Wire department at Lowes.com
Woods Yard Master 8-ft 16 / 3-Prong Outdoor Sjtw Medium Duty General Extension Cord in the Extension Cords department at Lowes.com
American and Canadian Market 8/3 Soow Sjoow Portable Power Cord Outdoor Durable Flexible Wire Cable 600V - China Soow, Soow Cord Specs | Made-in-China.com