The news is a bit late as NewEgg is currently out of stock, but it is worth keeping your eyes peeled for the Vega 56; a mid-range card at a mid-range price is somewhat rare at the moment.
MSI are selling their Vega 56 Air Boost 8G OC card for $279 USD, though keep away from the Canadian site as the price drop has yet to spread northwards. While not availble at the time of this posting you should pay attention as not only is the card likely to come back in the not too distant future but this may prompt a drop in price for other cards.
This particular model sports a Core Clock of 1181 MHz which can hit 1520 MHz on Boost and the 8GB of HBM2 runs at 1600 MHz on a 2048-bit interface giving it an impressive amount of bandwidth. It is admittedly not a new card, you can see how it was received when it initially launched right here.