The best you'll find in terms of discounts are via the
Apple.com Refurbished Store.
I expect that in the next month or two you'll see tons of retina MacBook Pros turn up there, especially given how picky Apple customers can be, often returning the same (perfectly fine) computer several times until they get one that's "perfect" in their eyes. That's why most Apple refurbished products are practically brand new.
If I could have waited, I would have, but I needed a new laptop ASAP.