A lot of the places I called won't do the rear in one piece and if they do, they charge more for it so I think the price is fair. I don't know much about Xpel tint, I've used Llumar in the past, but based on the spec sheet it seems to have similar properties to the other big brands. I know folks have taken their car to Mr Tint and have been happy with it, they use 3M film and can do single piece.
PRIME XR PLUS - XPEL
PRIME XR PLUS - XPEL