Hi Tony,
I regret but I won't help you find a Master Reveil as I've not seen any for years. But I suppose you may find one used if not new.
In the meantime I must add that the Memovox/Reveil function is a very nice complication to live with as you can actually use it (I personnaly own a Master Memovox)!
The Master Reveil is the automatic version of the Master Memovox (in a larger case, with the date). Jaeger-LeCoultre is one of the great players historically speaking on the wrist alarm market.
This calibre is an old base, several times updated, and in my experience quite reliable. IMO it has always lacked the fast date change (not a problem though, specially if you wear it daily or put it on a winder). Its other weak point is the fact that the hammer is released after ringing so keeps moving for around one hour (the simple and easy solution being to set it to another alarm time and rewind the alarm at least a half turn of crown and the hammer is blocked again).
The watch was indeed discontinued three or four years ago. It was not really replaced, except by the Amvox1 which uses the same calibre.
Other alarm models include the new Extreme World Alarm and the Grand Reveil, very different watches from the understated Master Reveil.
Hopefully they will relaunch a simple alarm watch someday, based on the updated calibre introduced with the Extreme World Alarm (has anybody seen it, not me?), but I have no information so far.
Good luck for your hunt.
Dje