This opera recording does not seem to be available in the US. I have it as a private recording made off a Radio Montpellier (or whatever it's called) broadcast a few years back, but here it is in official form.
http://www.amazon.fr/Edouard-Lalo-Fiesque-op%C3%A9ra-actes/dp/B005CX78ZA/ref=pd_sim_m2 (http://www.amazon.fr/Edouard-Lalo-Fiesque-op%C3%A9ra-actes/dp/B005CX78ZA/ref=pd_sim_m2)
Those who love Lalo will find plenty to enjoy here, especially since much of the opera was later reused in more now-familiar contexts. Alagna is the star and is in good form (I believe his ex-wife was originally scheduled to take part, but their personal problems intervened.)
David