I have been using my old 2012 Macbook for a long time and need to upgrade to a newer machine. I have upgraded the internals and replaced the main storage to a 512GB SSD and replaced the CD drive with another 512GB HDD for a total of 1TB storage. Upgraded the RAM to 16GB 1600Mhz. This runs very well and still has decent battery life. I can replace the battery before selling for extra.

$400 OBO.