7dayshop Laura. I get all my cards from there, no fakes as far as I'm aware.
7dayshop is great for a lot of stuff. I used to spend a fortune there when I was still shooting loads of film. I did buy some CF cards from them years ago, but I sent them all back. Often 7dayshop stuff comes removed from the OE packaging and unsealed. They weren't keen to take them back but I quoted the manufacturers advice (cards should always be supplied in complete and sealed packaging) and got my money back on em. Same thing with OE printer cartridges, I returned them and got my money back.
7dayshop told me they were removed from the packaging to cut costs and storage and postage.
Now I ain't saying that the 7dayshop stuff wasn't genuine, but the seal is part guarantee of a genuine card and I can take the chance of rip off crap.
Also bear in mind that much of what 7dayshop sells is grey market. So your guarantee is with 7dayshop only. 7dayshop always sorted out any issues I had, if a little reluctantly on a couple of occasions.
Used to be great when they sent literally everything VAT free, but they play by the rules now.