These are "community" forums -- which really means you're asking other camera owners. There are Canon moderators but they are not support representatives.
However I can tell you that Canon does have a "loyalty" program which allows you to trade in a camera body for a pretty good discount on a newer model camera body The details are not posted online anywhere and not all products are available via the trade-up program. To inquire, you really have to phone Canon support to ask them about it. They can tell you which products are available at the time (what they offer this month could be different next month).
In the pecking order of things... there's the newest gear (sold at full price), then the gear that's been out for a while and might have had it's price reduced, then there's the occasional sale, then there's the Canon "refurbished" gear store (that's a section of their online website), and then there's the "loyalty program" price... it is typically the best discount you can get on gear.
As for the comment about "not taking the best pictures anymore"... we'd need more info. Most ANY camera can take a great picture in good lighting. They may not perform so well if you're trying to shoot in "challenging" circumstances (poor lighting, fast action + poor lighting, etc.)
Tim Campbell
5D III, 5D IV, 60Da
