I am thinking about replace my basement windows before we finish the basement. These windows are very old (60yrs old?). There are 7 of them. I measured from inside the concrete opening is 32.25"x14.25". But it looks like the opening is a little deeper (about 16") originally.

I plan to replace them by myself and I am confident I can install them properly. I have been Lowes and Homedepot but I don�t like their basement windows. I am in Boston, MA. What I am looking for is vinyl hopper basement window with a better quality than HD one. The Lowes window is not easy to take apart of them for repair/clean. I have asked two building supply companies but they don�t have basement window in stock and also they don�t want to deal with end user. Is that the policy for all window dealers? Do you know any place will sell windows to DIY guy? thanks