Oh! This is actually a much older thread, I should have mentioned this when commenting, likely AbbyNTim worked this out already, sorry for the confusion!Trader Joe's has freeze-dried beef liver in the pet treats section. I keep a bag at home in case I have trouble finding non-chicken liver at the grocery store.
Remember to look in the frozen "weird" meat section of your grocery store. I have found that even the smallest stores have beef or calf liver there.
International markets and halal meat stores invariably have lamb liver.
My cat had a chicken allergy for months. It was probably caused by the fact that I fed him chicken almost exclusively. I cut out all chicken for a few months, then gradually introduced it back as part of a rotation. He is fine with it now.
I just wanted to comment re: the premix Balance IT.