Cheapest: buy dry-apply screen protectors from eBay.
More expensive: buy tempered glass screen protector from eBay
Most expensive: buy replacement screen+display, either replace it yourself or have a shop do it for you.
As for getting rid of them? you're stuck with them. There is no way I've seen to get rid of them. Sorry!
+1
I've had various smartphones in the last 6 years. With and without 'Gorilla glass'. Never with a screen protector. Yet I never had any scratches on the screen. Smudges plenty, but scratches
none!
But then my phone is always protected by a silicone bumper case so that the screen never touches e.g. a table's surface when it's upside down. Also the phone is never in a pocket together with items that can scratch, e.g. keys, coins, etc. Disposable tissues are the scratchiest stuff that ever touch the screen...
That m.o. works, evidently.
