That doesn't make it legit. If they were taking your card number of course they would only charge $2 so you don't get suspicious. Then later they go buy a new amp with your info and leave you to deal with the shit.
And anyone can put any kind of number, letter combination on your statement description including freeskier magazine's phone number.
Of course this doesn't neccesarily mean it is a scam, just that it might be. And I didn't get the email so I dunno, but I'd try and contact the magazine to find out.