You cannot buy an "Apple Original" display. Apple does not sell parts and does not authorize its suppliers to sell parts. Anything you buy that says "Apple Original" is from a sham company and should be avoided.
You can however, find screens sold as OEM. These generally use the Apple LCD and glass similar to what Apple does. Its not true OEM but its close enough in most cases. But in reality, they are still high copy.
So the reality is that it doesn't matter where you buy from, the parts are all knock offs. Buy from a reputable seller that stands behind their products. That's really the only difference.