Replacing One Window

We'd like to replace a second-story window in my son's bedroom. We are also interested in some kind of safety screen that locks so he can keep the window open while playing in his room in the warmer months. The window faces west, so we would also like some kind of UV-tinting, whether as part of the new window or added on as a separate treatment. I've contacted many of the recommendations from the archives, including A-TaylorMade and Bestoff. Everyone I've talked to so far has a four-window minimum order. Can someone recommend someone who would do good work with a small order like ours? We're in Berkeley. Thank you very much.