My favorite places for glucose supplies.
Powdered glucose (dextrose). I get this in large bags. Here is the cheapest source that I’ve found.
For tablets, I would prefer to get them at Publix, but, Walmart is cheaper. Publix $5.99 for a 50 count jar; Walmart is around $4 for the same thing. You can order these from Walmart (on-line) with no shipping charges if you spend over $50; I go through enough that I have to problem buying $50 worth. No brainer. I also carry around little tubes that hold 10 tablets; they are easier to fit in my pocket.