Well, you can't include sales tax in your comparison, since Amazon is legally obligated to collect sales tax, whilst Newegg is skirting the issue by not having a place of business in your state.
Aside from that, if you look at the listing on Amazon, you'll see that Amazon is the seller. That means Amazon sets the retail price, not Obihai. Obihai is wholesaling the devices to Amazon, and Amazon is deciding the profit margin they (Amazon) want to hit. Of course, Obihai could lower their wholesale price, but we have no insight as to the contract between Obihai and Amazon.