I can beat that!

I get my stuff from discountpetmedications.com. I always order a year of heartguard and frontline for all my dogs and cats at once. It's free shipping on orders over $100.

Here is frontline for cats- http://www.discountpetmedicines.com/...us-for-cat.htm
3 pack- $37.50, on sale for- $32.50

EDIT- oh my gosh, I looked at the prices you listed completely wrong! 6 pack for $43.75- that's amazing!! I thought it was a 3 pack for $43.75.