How about lowering the price of an essential service NAT gateway? Each NAT gateway is $33 per month (without bandwidth charges) and generally if you want to be HA you need one NAT gateway per AZ.
Does this mean running a VPC in each AZ connected via Transit Gateway is 100% cheaper than a single VPC w/subnets in each AZ?!<p>Regularly see EC2 interzone account for 1/3 of EC2 cost this would be a huge win if so (albeit totally ridiculous).