Google recently dropped the starting price of the Nexus 5X to $349.99. If you think $299.99 is a more reasonable price, you had your chance on Black Friday when the phone was available at that price, an $80 discount at the time. Presumably you didn't get to place an order back then. Well, here's the second chance you've been waiting for.
This time you're getting the phone from BuyDig via eBay. The 16GB Nexus 5X is going for $299.99 and is available only in black (white shows up as out of stock). The 32GB model sits at $349.99, also in black. Both are $50 off their usual prices. Each also comes with a $20 Visa gift card.
Shipping is free in the US. The seller is willing to send units to a number of other countries scattered across the planet, so it's still worth taking a look if you live elsewhere.