the equivalent in Indestro would be a 47015 (12-point) - it will look the same, but have a different part number and name on it. for that matter, a "Wizard" would be the same socket as well... but if you're like me you want the exact match, right?
keep pluggin' away at Ebay is about all you can do.
I've been looking for a #46015 Indestro 15mm (3/8" drive) for several months without any luck.
sometimes it just takes a LONG time for stuff to pop up.... I've been looking for some 1/4" Indestro extensions for months, and earlier this evening got an email saying "check out my ad I just listed some extensions" - picked up a dozen of them!
you might want to send this Ebay seller a note and see if he might be able to find one for you:
http://www.ebay.com/usr/toolandpartcrib
he's pretty much my go-to guy for filling holes on sets.