PartyLite sells them - the good ones. I'm not sure how expensive they are, but if I had to guess, pretty expensive. My friend has them in her house, though and they smell good.
I've never tried any of the ones made by other companies, but I love the ones from PartyLite. I think the Ocean Breeze one I have was like $40, but I've had it since May and it's still smells awesome and has at least 1/3 of the oil left.
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