Tai_Pan almost word for word same experience I have with trying to order..... but may be a good thing because I saw that someone mentioned that there could be some power problems with them as they can top out at 800 watt and only have 3 pci-e connectors to power 3 boards.. that's a lot of juice on those lines... not sure how safe that would be?
As for the power issues, I think Baikal would have figured it out before delivering. 2 in 1 pci-e cables to share the load, perhaps?
I don't expect cables from PSU to be the problem (PSUs likely to have two 8-pin pci-e connectors on same cable). I expect 6-pin connectors (baikalminer tweet specifies 3 x 6-pin) to burn-out under load. Soldering the pci-e cables to the board would be good prevention if one would like to mine X11 at the beginning.