The B. wavrini have appeared every year it seems since there are a lot of exports from the Rio Atabapo area, but they are seasonal. Might be awhile before you see them again. I've also seen them of Jeff Rapps lists frequently as well.
You should email them directly, they may not have any at the wholesale operation but I was just at the retail store and saw this species available Sunday. They often ship direct from the store.