Sound Asleep the problem is current Dash 8's or ATR's from the factory floor are well above the required size for what Rex needs - even the smaller ATR42 seats 50. They make their money on a 34 seat turbo prop to small regional ports which they only just manage to fill - anything larger than that will result in empty seats.
So the question is, does a turbo-prop upgrade even exist for their 30 seat niche market? Most of them went out of production in the 90's