I know you can order the yihi boards from china their $35 i know its bad timing but its worth a shot.I almost bought one. Decided to buy 2 DNA 250C and 2 DNA 75C boards for spares instead while they were on sale and still shipping.
I would love to get my hands on a Yihi 485J board to replace one in a SX Mini SL Class I have that finally went tits up. Haven't had any luck trying to get hold of Varitube.