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Refills for Reed Diffusers

My girlfriend buys reed diffusers from a company called West Elm for about twenty bucks apiece. When the scented oil eventually evaporates, she buys a complete new diffuser because the company does not sell refills. It would be great (and economical!) to be able to make our own scented oils to refill the bottles. I have seen cooking recipes on Instructables so maybe someone out there has a recipe for making scented oils. Thanks!