hi there i dont know about the vinyl type. what i did is get black out honey comb shades. a little pricey but they work very well. i got mine at "Home Depot" check it out
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My parents ordered vinyl blackout drapes for the upstairs bedrooms in their home from a JC Penny catalog in the 60's. I remember picking out the color for my room from the catalog. They are also good for insulation which is why we ordered them, my parents live in Iowa. I don't know if they still carry them, but I would also check out Sears as well.