I wasn't sure where to put this so I put it in the General section.
My friend sent me this link.
www.petsuppliesnet.com

I compared Frontline Plus Cats on www.1800petmeds.com
and their prices are as follows:

3 pack $44.99 on sale for $40.49
6 pack $81.99 on sale for $75.49
12 pack $158.98 on sale for $145.98
all with free shipping.
well at
www.petsuppliesnet.com
Their prices are as follows
a 6 pack for $43.75 that expires 6/09!!!

Heartgard on Pet Supplies.net for a (51-100 pounds) 6 month supply is $28.95 expiring 3/09

on www.1800petmeds.com
51-100 pounds a 6 pack is $34.99 and 12 pack is $65.98 with free shipping.
I think even with shipping costs - the petsuppliesnet.com is STILL cheaper!