I've got several dogs and cats at home, and we live near fields with tall weeds. Therefore, summer time is a flea nightmare! I've bought the "cheaper" flea/tick remedies from the pet store, but they didn't work too well. Recently, I found my premium flea/tick products (Frontline, Advantix) on eBay.
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They aren't sold in the individual packets, instead they are packed with a syringe and bottle. You pour the large dose of medication into the glass bottle, measure it into the syringe (no needle, of course) and apply it to your pet based on weight. It is exactly the same as having the vet apply it, but much cheaper!
I bought a one year supply of Frontline for my Sheltie, and spent less than $30! That is even cheaper than the brands that don't really work. All you have to do to save money in this case is measure it yourself. In my opinion, it is definitely worth it. Make sure you double check the seller's description, EPA approved Frontline doesn't have an expiration date. Good sellers will display this info, and feel free to ask questions.