You would need to order the Metronidazole online - you can find it at Jefferspet, Valley Ag and on Ebay. Jefferspet also carries Acidified Copper Sulfate.
https://www.jefferspet.com/products...84b39fa2600f000004f4/533884b59fa2600f0000051e
https://www.jefferspet.com/products...84b39fa2600f000004f4/533884b59fa2600f0000051e