The feed stores around here have duramycin. I've heard a lot of great things about Tylan. Does anyone have a preference or some wisdom about which would be better? Is this a good deal? - http://www.amazon.com/gp/product/B00061MQIC/ref=cm_rdp_product It seems ridiculously expensive, but maybe worth it?? Is there a place that you've gotten it for cheap? I'd rather do the water soluble than the shots. I'd love any thoughts or suggestions. It is to treat my flock of shaky headed sneezers. Thanks!