So I have never seen anyone put this method down on any methods I've ever seen, and this how I get my serials. I dont purchase serials, I dont ask people selling their crap on E Bay for it, I don't email blast....no.
I just simply drive up to the store that has the product I want.
I walk up to the counter or ask a store clerk if I can take a look at the product.
Then when I have said product in hand-I take a picture of the serial number because it's printed right there on the outside of the box!!
Now, if the clerk wants to get nosy I tell him Im just taking pictures to make sure I got the correct model or version of that item my girl told me to get, or else I'm gonna never hear the end of it!
That usually gets a chuckle out of em (Usually the guys agree with me and the chicks always say something dumb like "You better!" or "Happy wife, happy life!" and they dont ask no more.
One of the best parts about this method is there's no guess work. It would take me much longer the go through the process of emailing people on Ebay and waiting for answers, or paying someone with bitcoins and then have to wait for over an hour (even though you sent it 'priority' whatever THAT means cause its still slow as your mom with her one leg trying to enter a cow chasing contest) before the first authorization is verified. And unless you happen to have the luck of a black cat who just broke a mirror on Friday the 13th the only way that serial number is no good is if someone came in just before you did, and grabbed that serial number for the same exact purpose as you are about to do to the sorry ass sap that's going to buy this right after you.