https://bitcointalk.org/index.php?topic=220468.0 <------ if you got balls, their price quite nice thou

K16方案 每片主板上16芯片(主板+散热片+风扇）加工报价：788元/板（团内优惠价格699元/板）（请提供16片Avalon芯片）

translate
K16 assembly, 16 chips (mainboard, cooling, fan) plus labour charge : 788RMB (around USD128) supply your own avalon chip

they will use their chip 1st ( they ordered 600 of them ) if chip is spoiled during assembly they will replace them.

so far this is the best deal, but if u dare to deal with them