good source of obscure IBM parts?

As the new owner of an abandoned IBM product (Thinkpad Power Series 850, 1995, not on topic, though highly advanced at the time and now abandoned) I was wondering if anybody had any favourite IBM remarketers they turned to when in need of IBM unobtanium, or were chummy with any warehouse managers... I'm willing to throw money at this one, it's too close to being Really Cool to not. (: For those unfamiliar with the Thinkpad Power Series line, they are IBM's brief foray into the RS/6000 laptop market. The 850 sports a 100 MHz PPC 603e (not speedy) and a surprising array of multimedia capabilities (including NTSC video I/O), and runs AIX up to 4.1.5, or 4.2.something if one feels lucky. I'd appreciate any leads anybody could pass on. ok r.