Hey there,

Avalon sells those units and they come either as a 3-module (63Gh/s) or 4-module (85Gh/s) unit. HorseRider purchased 50 of these units and put up a portion for sell.
He allowed sells for as small as 1 module (~21-22Gh/s), which is what I opted for and what is up for auction now.

Please see his thread in my OP. It should make things more clear.

Thanks!