What's your strategy for buying Ammo?

Yes, I know we are all on "the list." The question now becomes, "what makes one of us stand out in a crowd on that list?" How much can I buy in one order that wouldn't be "noticed" and action taken (i.e. an ATF visit)? Can I buy 1000 rounds per order safely? And do that, say, twice a month or so?

This is what I'm trying to figure out. And was wondering how you all would do it.
10 K of 7.62x39 within 2 years ,3 K at one time , 1 K of other calibers......sans visits all from one on line vendor so far