Are you from the UK, Dark Walz? I have a vague recollection that you are, but I might be thinking of someone else!
Anyway, if you are you can get frontline from herehttp://www.vetuk.co.uk/index.php?mai...11d9861e90f07b
It will be cheaper than getting it from your local vet too and it is the real thing. Too late to get before xmas now but it usually comes in about 2 days. I ordered some feliway from there on monday and it arrived on wednesday, even with xmas post.
Advantage isn't available from online vets as it's a prescription drug - although you should be able to pick some up from your vet without an appt or taking your cat in. I think they are supposed to have seen your cat within the previous 6 months or something in order to dispense it.