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I can't belive we've never heard of it. Is it way more expensive than most flea and tick prevention?

I was reading a 'Dog Fancy' magazine and came upon a page for "vectra 3D". It is a Flea, tick, mosquitoe, mite, lice, sand flea and biting flea prevention. My questions are - does anyone here use it? what IS it? How often do you have to buy it? I'm going to ask our vet, but since Im so...