From what I understand Aura Blues are just like Blue Versions of TT, is the recent discovery what is limiting the supply to the US? If it is I wouldn't worry. Some asian shrimp farm is probably mass breeding them and they will be shipped over soon enough lol
Even some of the wholesale lists I look over they have BB,WR,KK, SSS+, PFR all in huge quantity and Aura Blues are listed as limited quantity, so maybe not a lot breeding them yet. Tigers too from Asia seem to be a bit limited. It's the Germans that love them some Tigers.