Share 'Derris Dust alternative'

Does anyone know a solution for Flea Beetle infestation now that Derris Dust is no longer on the shelves.  This is the first year I've really had problems with them, and in addition to massive damage to my swedes, I've also seen Flea Beetle damage (and the beetles themselves) on my Pak Choi, Cauliflower and Brussels sprouts.  I've used up the last of my Derris Dust now and need something else to…