Oy, Luke, pardon a bit of an oddball idea -- my specialty, everyone elses' headache, typically -- but if you're desperate enough -- how much would it cost to buy a fat stack of DIMMs with the right chips and hire some bored dude with a hot air machine or reballing station and the skill to use it, to extract what you need and recycle the rest...?
I know that's not the, er, usual way of acquiring chips of /any/ kind, but it sounds like we're approaching throw-it-at-the-wall-and-see-what-sticks territory anyways, so I thought I'd offer that one up, see how much glue it has to it :P