Actually, I bought one from the online store, It just cost about $10, it's quality is quite good and doesn't occure like what you mention

How much is your screen protectorsand where did you buy it?

Last month, I bought a screen protector for my mobile phone. I bought it in a very cheap price. But a week after, I noticed that a small portion of it was damaged already. And when I tried to pulled it up, I saw the screen of my phone full of lines. Do you have any idea guys on where to buy a nice and safe screen protector?