I stopped by Home Depot in person after dropping my brother off at the airport. Turns out I was given bad information on the phone. The window guy was puzzled about why I was told the window was American Craftsman and would cost $186. He said that it was PlyGem windows and American Craftsman was one of their lines. The 500 series vinyl windows can have tempered glass added for about $9 to $10. Base model is $91. If I get it with grids it goes up $15. And the exterior screen for the window is $5.78. With the screen on the plain window with safety glass it would be $106. With the grids it would be $121. I *think* the grids are between the panes (the windows are double-glazed and have argon).
This is the plain window: http://www.homedepot.com/p/Ply-Gem-2...-510/204293170
This is the one with grids: http://www.homedepot.com/p/Ply-Gem-2...-510/204293186
I asked the sales guy for windows that will work as replacements-- although the website says these are for "new construction". I wonder if that makes much of a difference. The only customer review said that the homeowner was able to install the window himself. He didn't specify if it was new construction or old though.
The installation instructions for the window mentions using weather resistant barrier OR pan flashing. I don't know which of those I would use or which would be better. But apparently it affects the caulking.
If I go up there again when the sales guy is less frazzled (he had just cut his finger and bled all over the floor before he came back from cleaning it up and getting a bandaid), I might find out if other brands of the vinyl windows can have the tempered glass and price them out.
The Plygem ones seemed fairly decent-- but I wonder if the tilt-in for cleaning thing is a good idea for a shower. Also, some of the windows in the store appeared to have some sort of felt or furry material that helped the windows slide up and down. I'm concerned this might be a trap for moisture and build up mildew & mold- or that the material could be damaged by moisture.