What Newhaven price are you basing the x3 cheaper on? In the UK for example if I go to Plusopto for Winstar displays and ask for 500, that price would be be not far off the 1off number on the Newhaven website. The catch would be a lead time often IRO 12-14weeks if its not on the shelf (e.g VATN). By going with the recognised reseller you might even be able to say, I want 500 over the next 12 months, get the 500off price and receive them in drops with the reseller holding the remaining stock. China direct by contrast tends to be a cash-up-front sort of a deal