Aftermarket Windows

before you order a windshield from one of the resto companies, talk to a few local window guys. I bought and supplied an AMD windshield for my '70 Dart and the window guy said he could've got it. Seals too
Not sure I understand. I am planning to get a new windshield for certain, as the OEM one has turned brown-ish along the top 6" of it. My plan was to just order one from an aftermarket supplier (i.e. AMD, Classic Industries, etc). I want the shop doing the build to install it, as I don't trust the independent installers with their 23-somethings doing the work due to likelihood of scratching my expensive paint job. Are you suggesting to source the windshield through a local glass company? If so, will it save much $$$?