Ahh, I hope that's not true, but it may be here (at least for certain colors).
So far, I can't find a single boutique/dept. store who ordered the blue (the bright blue I'm dying for!) in anything but a Jumbo. NM only ordered the Jumbo, and same with BG... and the boutiques - only Jumbo!
Saks I'm not sure about yet. My SA at Chanel put me down for the fuschia medium flap and blue Jumbo (though I would kill for a medium) a while back... I *think* he mentioned that they were only getting the maxi and the medium in fuschia... and no Jumbo! So confusing!