Hmmm normally their FB page accepts orders from the regular newegg website. But during the Black Friday & Cyber Monday sales, they said only Neweggbusiness.com is accepted but later changed it to both regular Newegg and Neweggbusiness because a lot of customers requested it.

So now, I assume if all back to normal, should be from regular Newegg. For the best answer, ask them on their FB page.

that is if u order frm newegg on black friday & cyber monday , now all back to normal 

As far as I know, if the product is under sale, then yes have tax. If you're buying regular priced stuff, then they don't apply the 8.75% tax. I think this is because the discount is only applicable to US citizens or something.

I asked for a quote for 2 items before the sale season, both items are listed on regular newegg.

1 was a ram which was without discount, they quote me without the 8.75% tax.

The other was a tablet which was on 25% sale, they quoted me with 8.75% tax.