Like Kyle, I'm a very happy D50 owner, having purchased my two D50 bodies and my lens set back in January, about the time the D50 was discontinued, but before the supply dried up. A quick check for refurbs, revealed only
this source. I'm not familiar with this retailer, and they don't have a stellar
rating on resellrratings. Whether you'd want to risk ordering from them or not, I can't say.
If you want to AF, your only real choices are the current bodies with in-body focus motor, the D80 or the D200, or a used/refurb d50 or D70 (or D70s). You might find something on eBay, but remember that it's used and might prove problematic.
If I were in your position, I think I'd just bite the bullet and go for the D80, but that's just me. You can get a D80 body for about $900 online, but would still need another lens for wide stuff. You could also just start over with a lower-end model such as the D40 and new lenses. That would eliminate your being able to AF with your fil's lenses, but that might be a good option. A D40 with 18-135 superkit lens and the new 55-200VR lens can be had for less than $1000 online, and would be a good starter bundle.
Good luck!
~YEKCIM