Depending on how many cats you have, someone posted instructions on how to use the large dog advantage on your cats to cut down on costs. That is what I am now doing and the vet was more than happy to help me with the instructions on the proper does for the size of cats.

Here is the part I saved on how to do it..

An X-large dog 6-pack of the blue (4ml) size from PetShed is $36 yielding 24ml at a net cost of $1.50 per ml

A dose for a cat under 9 pounds is .4ml and cats 9 pounds and over is .8ml

Does anyone have a dosage chart that breaks it down for smaller kittens? The free dose they will give to my two is the orange .4ml and they weigh 1.3 and 1.5 pounds so I guess it must be quite safe - is this safe to assume??

1ml=20 drops
.8ml=16 drops
.4ml=8 drops

Hope my math is all correct! I got the conversion from my memory from nursing school but double checked on a metric website

I am also NOT RECOMMENDING this - it is up to you but wanted to pass on what I found out. Measuring is tedious and the premeasured tubes are much easier to use. Also, the bulk would likely expire unless you use it often and regularly - but a good saving for rescue folks and the like.
I think that vet tech better get her information straight.

When I was at the vets with Poppy on wednesday, there was a guy there that needed Advantage for his cats. He has 4 of them.
The vet tech gave him the advantage for dogs and 1 tube is good to treat 4 cats. So he saved by doing it this way as where I am, 1 tube of Advantage for a cat is $13.45 and 1 tube for a dog is $15.00. So instead of him paying $53.80 for 4 tubes for cats, he paid $15.00 for 1 tube for dogs and as you said Debbie, it is the exact same thing.
I had to give our vet tech the lesson as well. She also was horrified when I said I wanted the four pack of over 50lbs for dogs. She knew we had cats! I told her it was the same thing and then she gave me the lecture on how cats and dogs have a very different central nervous system and blah blah blah. Then she read the ingredients on the package and was shocked. They are identical and it is only the dosage that is different. Just for fun she calculated the cost and if I had bought individual dosages it was going to cost me $97.00 but doing the breakdown myself it cost me only $30.00. She gave me two syringes and off we went. I will take that $60.00 savings anyday! A four pack for large dogs gives everyone in my house a dose of Avantage with a few drops to spare!
I'm lucky because my vet sells the tubes for $7.50 so it's cheaper for me to get it from them than to order it.
I have done this for the last few years and thankfully it makes it affordable for me to keep them flea free.