7006 might also fit the bill.  I've got a few of the different models but
not really looking to sell any.  eBay looks like slim pickings as well.
One seller has a bunch of 7009s, you might try to talk him down to a
realistic price.
If you need help comp.unix.aix on Usenet is probably a better bet.  I've
cataloged a lot of info at 
Regards,
On Mon, Feb 8, 2016 at 11:02 AM, Benjamin Huntsman <
BHuntsman at mail2.cu-portland.edu> wrote:
  Hi Paul!
    Thanks for the correction.  I don't know why I thought some of those
 had a PCI slot or two.  So nevermind the PCI part.  But I could still use a
 box that'll run 3.2.5 up through at least 4.1.5...
 Thanks!
 -Ben
 ________________________________________
 From: cctalk [cctalk-bounces at 
classiccmp.org] on behalf of Paul Berger [
 phb.hfx at 
gmail.com]
 Sent: Monday, February 08, 2016 9:20 AM
 To: General Discussion: On-Topic and Off-Topic Posts
 Subject: Re: AIX 4.1-capable box
 On 2016-02-08 1:05 PM, Benjamin Huntsman wrote:
  Hi there!
     Does anyone on here do much with RS/6000 boxes?  I'm looking for a 
7009-C10, 7011-250, or (mostly) PCI-based 7012 system capable of running
 AIX 4.1.
      By any chance, anyone have such a system that
they'd be willing to 
 sell?
     Thanks much!!
 -Ben 
 All of the systems you listed are microchannel machines.  The first PCI
 machines where 7020, 7043, and 7025-F40.  The 7020 run AIX 4.1.1 and the
 7043-140, 240 and 7025-F40 require min 4.1.5  7043-150 requires 4.2.1.
 Paul.