Hmmm... Not too sure...
But could you be more specific on what you meant by long tail...
I.e. Halfmoon, Delta, Superdelta, Crowntail, Doubletail, Spadetail, Veiltail, Bulbtail, Roundtail etc.

If Halfmoon, local fish shops normally don't carry them... Others, local fish shop usually sell, but not always very good quality....

And by the way, are you going for show quality or just normal for fun....

Sorry, couldn't help...