Find the cheapest product online. Have the link ready and ring petmeds (see website). They will reduce any price , below theirs , by 5%. I prefer to phone, as you know excatly what you will pay. They are a genuine company and owned by a vet , who's onsite.
Worm an adult every 3-4 months. I use Drontal Plus.
I don't routinely treat for fleas, but have some Frontline spray. This needs a free prescription from your vet, but the spot-on pipettes, used on the neck, do not.
Barbara, Monty, Joly and Teddy.