When the "carbon tax" is passed, fuel will go up, followed by transportation costs, followed by shipping costs. The consumer will pay for all of it, no matter whether as a regular shipping fee, or out of the price. It can't come out of the profits, since (except for maybe Estes and Aerotech) there are very little profits in the rocket business. There is no "free lunch", ever. Even when the shipping becomes entirely electric-powered the costs for the electricity, batteries (or fuel cells) and charging/fueling infrastructure will drive costs even higher.
So if you place cost above all else, total up the costs for EVERYTHING and make your decision. Don't forget the price you pay for poor service. Don't forget Sales Tax / VAT and your own vehicle operating costs if you instead drive halfway across the county to "buy local": when you figure everything, it might be cheaper to buy something out-of-state: sometimes, the tax savings offsets the shipping cost.
But I'll gladly pay a little extra for good service, whether its a local bricks-and-mortar, vendors at a launch, or a mail order vendor that takes the extra time to provide the best service he/she can.