A handy person from NC says:
October 7, 2016
How do you order FlexScreen 2 the for only 1/2 of the window.
Tom from SWISCO responded:
October 10, 2016
Thanks for contacting us! You can order the 1/2 Screen through the "Double Hung" section of the FlexScreen store page. You can visit that page here. Let me know if you have any questions, or if you would like me to clarify.