So this is the cheapest 120hz monitor I have stumbled across and I think it can go to 144hz as well, correct me if I'm wrong. Here it is:
http://www.amazon.co.uk/BenQ-XL2411Z-24-inch-Gaming-Monitor/dp/B00HZF2JWA/ref=sr_1_1?s=computers&ie=UTF8&qid=1404402335&sr=1-1&keywords=BenQ+XL2411Z
Just a brief explanation about picture quality and use for gaming will suffice
http://www.amazon.co.uk/BenQ-XL2411Z-24-inch-Gaming-Monitor/dp/B00HZF2JWA/ref=sr_1_1?s=computers&ie=UTF8&qid=1404402335&sr=1-1&keywords=BenQ+XL2411Z
Just a brief explanation about picture quality and use for gaming will suffice