I have the ability to source 180-190 proof corn alcohol. It could be sold in its pure state or flavored varieties (apple pie/peach/jolly rancher). This is the real deal and better than any grain alcohol you could find in a liquor store. Is this something that could/would sell on a DNM?
Definitely, but the cost and danger of shipping a liquid in large amounts makes it not worth it for most vendors and buyers.
People can go to their corner store and get a bottle of everclear for $15, you'd have to compete with those kinds of options.