i know i had a hard time getting them in japan, and they sell just about every monster out there. having spent 5 years in japan, i've only seen a black aro at the LFS's maybe 4 times, and i went at least 2-3 times a month. i've heard they are hard to ship when there small.
Very nice silver, Happy Mud Skipper... nice bold pink color! Now, silvers "better" than blacks you say??... perhaps to you? but everyone has their own preference of 'keeping what' for some reason??
Perhaps Twk1 has kept silver aros before?,,, and maybe wants a black now, just to have something different?? Or maybe, because blacks don't get as large as silvers do, thus requiring more tank space?? Who knows? But for whatever reason it may be, it's his choice of what's better to him?!!
Personally, I prefer blacks over silvers, basically because of them being more uncommon... but beleive me, I do still love the looks of a broad thick healthy silver w/ a vibrant pink/green color hue to it!