I recently purchased the inventory of an Aluminum Window Manufacturer Co. along with the five trailers they came in. They are various sizes and types. How do determine what the windows are worth? From what I can tell, there are single panes, double panes, arch tops, horizontal sliders, jalousie, single hung, clear glass, smoke glass, etc.. I'm sure you get the picture- Is there a general rule of thumb for pricing? I read somewhere W x H X 1.35 for Viynl, but that was retail. I want to sell these below manufacturer pricing- Thanks