I purchased Frontline Plus for my cat and Advantix for my two dogs on Monday and they just arrived today and I was really happy. Ordering was no fuss and the prices are a lot better than at the vet. I wasn't sure what size Advantix to buy for my little dog as he was right in the middle of two sizes so I rang and the lady that answered my call (Bess?) was very helpful. You should give them a try.

Approximate cost: $200