LCD screen broke, no display at all. Posisible repair shop ripoff.

The LCD screen on my A7 broke recently; the outer glass is intact, but the display is almost fully black with some artifacting on the bottom. It also doesn’t seem to respond to touch. I took it to a repair shop and they said they could replace it with a “low-sensitivity” screen that would cost $55, and a “high-sensitivity” that would be $75. When I look up screen replacements on eBay, some are like $200 and others just $35. What’s going on here? Maybe I’m just confused.