I'm shopping for windows currently too - I have used small home hopper and horizontal windows in the past with different advantages to each.
Found these on Buck Stop website. You can pick up from their store if near Hico or D/FW area or they ship.
Young man at Hico Store answered my email immediately and sent inventory list.
They have flip up and horizontal slider.....I'm liking flip up better so you have more usable space. Pricing is as good as I've seen. Tinted option really helps with privacy and they're virtually silent to open when needed.