Where to buy iPhone 5/5c/5s/6 digitizer?

So I started refurbishing screens at my repair store and want to take a step further. Right now i am taking good lcd's off screens that have cracked glass and then put those good lcd's on another screen with good glass. Issue is that I have a bunch of good lcd's, but not enough good glass. So i went online to Mengtor.com, which is where i get all my screens from and saw that they have new glass, frames, and adhesive and what not for screens, but the glass doesn't look like it comes with the digitizer and I can't find digitizers anywhere and its like almost impossible to take a digitizer off another screen with a heat gun and they just crack when i attempt. Can anyone tell me where to get the digitizer from?