For box stores and service I would recommend Totem. But like going to Home Depot, the time to go is weekdays; during the day if you can. That is when you get the older guys who are semi-retired working. They usually have the answers for you.
Option 2 is look around at houses under construction, look for a place that is at the windows and doors stage, and talk to the guys doing the work. You might be able to find somebody who can do the job on the side. Just be forewarned that dealing with Joe Contractor does involve risks; and you would be better insulated from those risks by dealling with a bigger company like Pella.
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