Shu Uemura's Volume Maker, $48, is like your dry shampoo, but a million times better, because it's easier to apply and gives your hair a huge volume boost. You apply it with a convenient brush applicator, which makes on-the-go touchups a cinch. Because it doesn't turn sticky or tacky, you won't get much hold, but it's a solid option if you like to be able to run your fingers through your hair.
Pour a tiny bit of Got 2B Powder'ful Volumizing Styling Powder, $6.49, into your hands, rub them together and apply to your roots. Ta-da! Insta-volume. Because it dissolves into a clear paste, you don't have to worry about white, dandruff-y residue (but be aware: It does apply a little sticky).