You can find single applicators on Amazon or eBay , though you should verify the seller's reputation to ensure the product is authentic.
While bulk packs are the standard, you can find single doses at these types of retailers: where can i buy single dose of frontline
Amazon.com: Frontline Plus For Dogs Single Dose. All Discounts. Today's Deals. Up to $20. $60 to $70. $70 & above. Get It Today. Amazon.com You can find single applicators on Amazon or
Smaller, independent pet supply stores are more likely to "break" boxes and sell individual doses than large chains like Petco or PetSmart. Frontline Product Comparison Today's Deals
Before you buy, make sure you're getting the right version for your pet's needs. Key Ingredients Standard protection Fipronil, (S)-methoprene Frontline Gold Faster action Fipronil, (S)-methoprene, Pyriproxyfen Frontline Shield Dogs only (repels mosquitoes) Fipronil, Permethrin, Pyriproxyfen Quick Tips for Application Frontline Plus For Dogs Single Dose - Amazon.com
Many local vets sell individual doses of Frontline Plus or Frontline Gold over the counter, which is often the most reliable way to get just one.