I personally have one of Bestem Aerials's designs with a pattern for the Typhoon H. I recommend the 30" diameter by 1/4" thick versions and not the cheaper fold-up ones that you need to use stakes to hold them in place. The Bestem versions weigh about 10 lbs and dont move or slide around when your Quad lands or takes off. I like mine sturdy and steady.
Amazon sells Bestem Pads for around $25-$75, depending on the design overlay you choose. I looked and Amazon has a nice one on sale, 30" by 1/4" with the Bestem logo on it for only $22.48 and that's as cheap as I've ever seen for a Pad this size.
OOPS! In the time it took to reply to your question, they sold out of the $22.48 ones but say they will have more in stock later. Just "search" Bestem Aerial on Amazon and you can see what else is available for a landing pad. Good Luck!