Wait. People wanting a D3?
I can sell you paperweights that are quieter, for only 500 dollars.
OP, your business makes little sense. Bitmain isn't sold out of anything. You are providing the same product, at a far higher price, with much more risk.
Nobody is going to buy 500 units from you, a newbie.
And nobody is going to buy fewer units at such price gouging.
Fighting a losing battle here. :/
But I'd be on your side, if you offered escrow on the forum.