Alternative to screen pation door?

Question:we just moved into a new place...it has a deck and a sliding patio door but no sliding screen door. we live by a river so i cant just leave it open without a screen.ive heard of those "drop screens" that are just velcrowed (excuse spelling) on but dont know where to get them? does anyone have some information for me...i dont wanna have to buy a brand new screen door.

Answers:
buy a screen door and it will last for years and you won't regret it. you don't want all those mosquitoes in your house.