Mac User Group used to run a members-only lending library but it was no longer viable. They want me to fix the 2009 13-in MacBook Pro to make it a saleable item.
I know its 5400 rpm 160 GB HD was replaced with a 7200 rpm 320 GB HD & its RAM increased to 4 GB. I know because it used to be mine before I bought the 2011 MBP. It has 10.6.8 on it but could theoretically handle up to El Capitan.
But with only 4 GB of RAM I'd not inflict anything higher than Mavericks on it unless the RAM was doubled to 8 GB.
Done some pricing, $135 will get 8 GB of RAM and a 240 GB SSD delivered here from Amazon in the USA.
I'll put it to the rest of the committee that I at least upgrade the RAM as it's already got a faster-than-standard HD.
Should be possible to sell it for around $400.