With the length you need you might want to give the Home Depot power cord a try. There are numerous threads about them on the AudioAsylum website and they faired pretty well against some much more expensive name brand cables in a shootout.
Best low cost speaker cables for my system?
I have Creek 5350, Rotel 1072, B&W 703's. Mated with Transparent Powerlink Plus and Guerrilla Audio silver IC's, the system sounds well balanced and emotionally engaging. Am looking for an affordable speaker cable to complete system. Am considering DH Labs Q10 ($185 per 6' pair). I need a 24' pair of speaker cables. Anyone have any other ideas? Thanks!