I use and like the flew poweder from Only Natural Pets. Copy and paste this link:
http://search.onlynaturalpet.com/search.aspx?searchterms=...
For controlling fleas and ticks directly on your pets there are a few effective alternatives to the drops (which have been known to cause seizures). Garlic is one of them but I never know how much to try and trick my pets into eating. It's easier with the dogs (I have two) but the cats (two again) just look at me like I'm crazy. There is a company called Shaklee that makes an all organic cleaner called Basic H and adding a small amount (1/2 tsp. per gallon) to your pets' water has always been effective for me. Basic H is actually good for a LOT of other things too. Shaklee also makes something called Basic G. You'd have to be careful administering this though; because while Basic H is harmless Basic G is a germicide and can cause some illness. I think 1/8 of a tsp. per gallon and I only use this when the flea & tick season is at its most intense.
Shaklee is a direct marketing company so you might check the yellow pages to see if there is a listed distributer near you or even check online.