I'm having a spare gearbox re-built at the moment, and needed one of those "no longer manufactured" bearings for the box. SKF 239924.
Quick search on Ebay turned 6 of them up, in Uruguay of all places.... New Old Stock, according to the blurb.
If anyone else is doing a box re-build, and needs one, the link is below. Note they are not cheap at US$69 + $30 postage, with possible customs to pay on arrival.
Now I wish I could find a new double race, FAG 3305-DA and FAG 514838