I bought the Tech Armour one from Amazon Canada for 11 dollars. It's like the exact size of the M9's screen and was a pain in the <removed> to install. The screen on the M9 is just slightly sunken into the bezel, so anytime the protector touches the sides even by a fraction of a millimeter, there's a large air pocket. Otherwise, I've found Glass protectors to be the best. I used my first on my main phone, the Classic and now on my M9, and I have to say I love the feel of them and the clarity.