You can try to search for holistic treatments for flea/ticks. Remember, it is not only the dog that needs to be treated...make sure the enviroment is always flea/tick free! I do think, however, that you can save money on that bill by using the minimum amount on each dog
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Make your dog taste bad to fleas
Fleas particularly dislike the flavor of garlic and yeast (nutritional or brewer's yeast). Mix some garlic and yeast with your pet's food. This can render their blood unpalatable to fleas.
Fleas are repelled by citrus
Organic Grapefruit Essential Oil
Calms. Deodorizes. Repels insects especially fleas. Provides a Clarifying and tonic effect on the skin and tissues. Believed to stimulate Hair growth. Useful in small amounts for dogs that have an imbalanced sebum production resulting in skin problems
http://www.flea-and-tick.com/