Cameron Dupuy has an Eb. Marc Savoy had one but recently sold it. You can hear his on the Back to the Basics CD. It's a bit of an oddball accordion compared to C or D and most traditional Cajun fiddle players will either tune a half step up or down to play with it.

my triple row is f bflat eflat
i play a few things on it
mostly so other singers can fit their range

wle