I would shop on price, or even buy one from a wrecker and have (check) the local cheapest sop install it. I have done this when the cost was 'mine' on a Topaz. I would use an installer, even though it is relatively easy (with some experience). I believe the parent company of 'Speedy Aotoglass' owns 'Apple' and many of the other outlets. There is not a lot to chose from on this relatively 'low risk' work. Inquire and shop around.
