I concur with Luke and Pesci. They aren't watching your bank account, so don't sweat buying legal stuff from online. Personally I avoid hydro shops because you never know when LEO might profile you (namely, I'm a bit young looking to be investing in expensive hydro equipment, not everyone has this problem
.). The only thing I'd worry about is getting a prepaid card to buy the seeds, because if customs ever decides to start busting people for seeds we aren't going to get a warning in advance. They can't pin anything on you for having seeds show up at your house; it could just be a prank or wrong address. If they decide to investigate though, they might spot a seedbank on your bank account and nail you. Without proof on your statement that you bought the seeds, they got nothin'.