Difference is less even than that if you got it a couple of weeks ago. My Pixel 3 cost $450, and it's the 128GB. If I could have gotten the 64GB, it would have been only $400, which is the same price as the Pixel 3a?
What discounts are these?
Pixel 3a will also be getting discounts, though. It's only launch and you can already get a $100 gift card at best buy with it