I was able to find a few sites (all in Eurasia) taking pre-orders for the Definitive Editions of
With Teeth and
Year Zero.
Release date is listed as February 9th, 2018. The prices (so far) range from $42 - $50 before shipping.
Year Zero (Definitive Edition) =
EAN/UPC 060255714275
With Teeth (Definitive Edition) =
EAN/UPC 060255714276
You can search for the specific EAN/UPC in Google to find more pre-orders.