Hi! One of our hens layed an egg with a tapeworm in it, so I'm deworming her and her pen mate this evening. They both are very healthy looking and acting so I'm caught off guard that she has a load this heavy. I plan a 2 fold treatment with valbazen and zimectrin gold. BUT I can't find valbazen in stock anywhere - even online. Did they discontinue or have a supply chain issue? If so, what's a good alternative? Thanks!