I'm well aware. Didn't know the IRS and the State employees browsed Macrumors.
Even then, its only really if the item is over $1000. There's a general tax that you can pay if you don't have all the receipts from all online purchases less than $1000 which covers throughout the year - came out $2 total. (I'm in college still so I make less than $10,000 a year). I'll continue to buy from B&H with no sales tax thank you.
Oh yeah, they monitor everything we do.
This is especially true for those who wants to get a government job. They made it very clear when I stopped by their counter during career fair, specifically pointing out no illegal downloads of music and such.