HFCS is more expensive to make than sugar, but it is cheaper in the US (and through exports this bleeds to other places) due to corn subsidies.
Similarly, there are a lot of meat subsidies and oil subsidies - to the point that market pricing only matter within small sectors, but not replacement sectors that aren’t the same commodity.
I suppose purchasing a colorful carton adorned by lots of writing in the "Vegan Isle" of a grocery store could be an easier way because the aforementioned steps may be far too time consuming for most people who want everything pre-prepared for them by a favorite brand and stored in plastic/cardboard/glass individual packaging.
Meat is a different story, because coordinating the grazing routines, herding (some canine breeds are helpful for this), winter hay feeding stockpile, veterinary treatments, calf birthing, nutrition feed deficiency compensation, slaughter (bolt-gun to forehead is most humane), blood drain (good composting material), and butchering into desired cuts would be consuming much more time than available in a highly specialized life.
For another example, I subscribe to Ethical Consumer magazine [1], who rate products and companies on everything from carbon impact to animal use/abuse to tax avoidance. Invariably, the most ethical products are the most expensive. It simply costs more when you don't externalize negative effects. So the products are there, but they're only purchased by the small cross section of folks who can afford to and choose to essentially double their cost of living. What we need is (at the very least) societal, structural incentives towards more ethical capitalism.
[1] https://www.ethicalconsumer.org