FYI cheap and good quality seldom go hand in hand.
Besides there's many good tutorials regarding making waraji floating around the internet and I've got the impression that most people make their own.
*~Cosplays in progress~*
Masamune Date - Sengoku Basara
Eren Yeager (casual outfit) - Attack on Titan
Sanosuke Harada - Hakuōki: Shinsengumi Kitan