FYI:

I've contacted a few manufacturers from Alibaba, most of my queries for P104-100 take very long to get answered and not even in a good manner. Anyway here are few price points they threw at me: $425 $478 $485 and from another manufacturer $880 $760. They also have prebuilt 8xP104 rig for about $4680~4880, some may accept small order if you contact them, i recommend using Whatsapp. They are available to pre-order only, available April. Most of the parts and the GPU itself are made by unknown or lesser known brands: newmagic, Manli, Inno3d, Jegy, Onda.... From which I only trust Manli and Inno3d. In order to order they mostly will talk you to add their Whatsapp number (or Skype) and pay outside Ali via T/T or some sort. Very risky indeed. Warranty will be 3 months for most if not all brands. After-sale support is horrible as I read the feedbacks from previous buyers and around the web; any broken card will need to be sent back costing lots of $$ even if you're lucky enough to get a reply from them. If you willing to deal with them I can help you find out legit manufacturers but again warranty isn't good and you buy with your own risk.

P/S: Luckily I found a distributor who travels back and forth from US to Asia to bring here some goodness, batches of P104-100 from Inno3d, MSI and Zotac available end of Jan and end of Feb. Yata! However I can't share his contact information without his permission. So sorry the community.