Check out rpilocator.com. I was able to get 4 different pis at MSRP over the course of this year.
Honestly I lost count how many times I perked up from the alert on rpilocator only for the stock to disappear while I was going through the checkout.
You do have to kinda watch it a bit obsessively if you're really serious about finding one, but it can be done. Or you could also just constantly refresh the page(s) of a couple of vendors that you know to get stock on some regular / semi-regular basis. Adafruit is one, and Elektor seems to get stock now and then as well.