Hi! What sort of age of MBP are you looking for? Are you set on 13"? ...just wondering if you are looking for parts or something to fix up and use.
I have a (I believe) late 2007 MBP, 15", 2.16GHz C2D, 4GB RAM. Works well with Lion, the only thing is that the bottom row on the keyboard ('z' to '/') sometimes doesn't work and just comes back after a while (maybe just a loose connection or software issue?).
I've bought an iMac just a couple of months ago and think about getting an iPad to use on the road, rather than bringing the MBP. With that I'd sell this one for a reasonable price considering the age and keyboard bug.
Let me know if that's something you are looking for at all and I can get you all details, pictures, ... from the machine at home later today.
Cheers!