Noticed price drops for a couple Revolution dog flea treatments at Pet House. They are lowest price even add on $9.99 shipping. However they have free shipping when order over $79 so might be better to order 2 * 6 packs.
Revolution for Dogs 5-10kg 6 Pack $54.50
Revolution for Dogs 10-20kg 6 Pack $58.50
Revolution for Dogs 20-40kg 6 Pack $63.50
Revolution for Dogs 2.6-5kg 3 Pack $28.50
EDIT: Just noticed Revolution for cats are on sale as well:
Revolution Plus for Cats 5 - 10kg Large Green 6 Pack $52.50
Revolution Plus for Cats 2.5 - 5kg Medium Orange 6 Pack $50
Revolution for Cats 2.6-7.5kg 6 Pack $45
To see more Revolution products compared over 50 shops:
Awesome price, thanks!