I think the problem here is I see most people are wanting to buy this as a replacement for clear coat. This is supposed to be a playfield protector, not a replacement for clear. The fact it scratches is part of the protection (scratches it not your playfield). Difference is with your PF you can novus the scratches out to a point. Seems this product should be used to help save an old playfield that's starting to have wear issues or to put on a routed game to prevent the wear from starting and not to be used as a replacement for a professional clearcoat job (the shiny look).

Couldn't you just put it on the floor, lay your glass on top of it and hit it with a heat gun real lightly to flatten it out?

The place MK1 linked only charges $10 extra for oversize. So about $50 from what it looks like.

I wouldn't let the rolled up delivery steer you clear either. A hair blow drier would work just as well. Just take a bit longer to heat it up. If you have more than 1 pinball machine you could also just take the glass off both and put the sheet in the middle and leave it in the sun for the afternoon on a warm day (may have to wait a bit for that in NY though )