The smallest I have found is a 500ml bottle for around $50. I only have 6 chickens so this bottle would be way more than I need. Anyone know of a source that sells smaller amounts? None of the feed stores in my area have ever even heard of it. I can get Wazine for a few dollars locally but I have been reading that valbazen is better. Is valbazen so much better that it makes the extra $45 worth it or can I just go with wazine? I am mainly using this as a precaution. I have not seen any worms in the feces at this point. Thanks for any help.