Buster, are you still using the true powder formulation of the Bumble & bumble product? Not the spray version (which I happen to despise, as it's more like spray-on hair than true dry shampoo, I think). If you're still using it then you must have had it around for quite a while, because B&b hasn't made the product for several years now. The original B&b product was great, as it came in colors other than white, so a bit of residual powder didn't lighten your hair.
I still have some of the original powder, but rarely use it.
Most of the products marketed as dry shampoos are relatively expensive per container, but I find that they last quite a while. You can also use cornstarch baby powder, corn starch, or other starches (like rice or oat starch).
I don't like Psst because it doesn't seem to give me as clean a "feel", and also because the present formula smells too much like men's aftershave these days (I gather it's a new smell). I also don't like the fact that it's an aerosol because I do carry-on only. Relatively inexpensive per container, but the container doesn't last as long.
linsj, what brand are you using now?