Reddit mentions of ARGO Cornstarch, 35 oz

This is getting pricey:

Solution A:

• Potassium Iodate $40 (this is for 100g and the video calls for 43g).
  
• Sulfuric acid $20 I don't think this is concentrated enough to do the trick. This might be a showstopper since, even if I could get ahold of a higher concentration, I've heard too many horror stories about working with undiluted sulfuric acid that I may just want to pass.
  
  Solution B:
  
  
• Corn Starch $8
  
• Malonic Acid $10
  
• Manganese Sulfate Monohydrate $15
  
  Solution C:
  
  
• Hydrogen Peroxide $17
  
  
  And distilled water is a couple bucks per gallon at the grocery store. Looking at around $100, and that is assuming I get all the ingredients right the first time and don't have to reorder any of this and ruin some of my ingredients in the process. Many of the ingredients will have leftovers, but the potassium Iodate seems pretty expensive for such a small amount that I'll use half of just to make one batch.
  
  EDIT: Not too surprisingly, it seems like the acids and peroxides I've listed may not be nearly concentrated enough to do the trick.
  
  EDIT2: Updated hydrogen peroxide link to a 35% concentration instead of first aid style which is 2-3%.

Corn starch is the main ingredient in most baby powders and similar powders.... but a cheaper when it's called Corn starch at 25 cents an oz and not Baby Powder at 33 cents an oz

Different. Just get cornSTARCH.

Should be very white and a fine powder. Like when they show cocaine in Hollywood movies.

Unlike cocaine it should be quite cheap.

https://www.amazon.com/ARGO-Cornstarch-35-Ounce/dp/B0045DMLXM

It's used among other things to thicken sauces in cooking.