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You may have realized I've been on a quest to find the best (cheap) dry shampoo out there. I've found some good ones, but I always feel like they could be a little bit better. The most recent contestant is Aveeno Pure Renewal Dry Shampoo. It seems to get decent reviews, and sells for around $8, which is not mega-cheap, but affordable enough.
When I was looking at the ingredients list (after I'd already bought it - which is usually the wrong order to do things), I saw that one of its main ingredients is corn starch. That reminded me that before dry shampoo was readily available and affordable, I used to use corn starch regularly, mainly on my bangs. So I figured that a comparison was in order - if the corn starch works just as well, it's a hell of a lot cheaper.