There is markup with everything. Hell, most autoparts stored the standard markup is about 35%. I wouldn't get a windshield installed for 90 bucks. Its probably a cheap china windshield that isnt dot approved but says dot on it. I would go with the binwanger glass over the other one. They are a big company that will stand behind there work.

 

I went ahead and dropped it off at Binswanger on my lunch break. It was convenient for me as I pass it everyday to and from work. $200 installed with tax. I'm about to pick it up in about 45 mins. I'll let you know how it turns out.