13" 2015 MBPs are not discontinued. The Apple refurb store typically sells discontinued models for a couple hundred dollars less as soon as new model refurbs appear, so figure at least 3 months for a 15" refurb with a good deal.
Because of the major price increase of 2016 models, I wouldn't expect to find good deals on 2015s on closeout. Full price, they now look like bargains!