EZI-Shade or Quick-Shade are the best on the market, but you will pay close to a gorilla. They are steel framed and come with a heavy duty nylon material
There are cheap ones on the market ($250 ish) but they are alloy framed and light meterial. They last o/k but you have got to be carefull with them when set-up/set-down comes along. And if get's windy, pull them down ASAP, they dont like the wind at all.