When it comes to cost per carb perspective, powdered carb supplements win over numerous popular primary carb sources. There are other factors that may influence your primary carb source intake, but if budget is first priority, carb powders will help you out.
I don't recommend that you obtain a large portion of your carb intake from powdered carb products, but they can be useful when portability, speed of preparation, and convenience are important.
Dextrose cost per gram = .5 cents
Maltodextrin cost per gram = .5 cents
Oats = .6 cents
Pasta = .7 cents
Rice = .5
Grape juice = 1.8
Orange Juice = 2.7
Gummy Bears = .6
Waxy Maize has a cost per carb of 1.5 cents. I don't feel that waxy maize is a smart choice when it comes to carb powders.
I'm interested in hearing your thoughts on this and what other factors you'd take into consideration when deciding to consume a carb powder or not.