I've been looking for a dry shampoo in a spray can that does not contain butane and propane. No matter how good it works, I cannot with good conscience spray lighter fluid on my head. That can't be good for you.
Blow Pro Faux Dry Dry Shampoo is a powder-based formula that comes in a soft can that you squeeze to emit a fine puff of powder that really soaks up any oiliness in your hair. There is no aerosol, no lighter-fluid ingredients. I've used other powders, but I find this one to be really amazing, as only a very small amount is needed and it really works. I bought it on folica.com, and there were lots of good reviews there. I have to agree with them -- this is a great product.