If you're in the market for a new screen, then this Ritescreen white multi fit replacement patio screen or this Ritescreen bronze multi fit patio screen from Lowes might be just perfect for your needs. These Ritescreen replacement screens come in 30 and 36 inches, so at least there are some options. These units come with a spring loaded aluminum expander which enables it to fit in different openings, therefore you don't want to pick a roundabout size, but it doesn't have to be perfect. The frame is quite heavy and durable and should stay in good condition for quite some time to come and it also comes with UV resistant locking handles. If your current screen door suddenly broke and you need a new replacement screen, then buying one of these Ritescreen multi fit patio screens seems like a very good solution. At Lowes you can find these in white, bronze and gray, so just pick the one that would go best with the decor of the interior as well as exterior of your house. 
RITESCREEN 36" Bronze Multi-Fit Replacement Patio Screen
"Height adjusts 77-5/8 In. to 80-1/8 In. Spring loaded extruded aluminum expander for easy installation and durability. UV resistant locking handles. 2 In. heavy duty frame" 
RITESCREEN 36" White Heavy-Duty Multi-Fit Replacement Patio Screen
"Height adjusts 77-5/8 In. to 80-1/8 In. Spring loaded extruded aluminum expander for easy installation and durability. UV resistant locking handles. 2 In. heavy duty frame"These doors are from lowes.com
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