Which pyrethrin spray for chickens?

[ZaneyMama]

My chickens have mites and I need to treat them. I don't want to use carbaryl (Sevin Dust). Which pyrethrin spray can I use on them and where can I get it? I am in Colorado near Boulder - we don't have a big animal supply place near by.

Thanks!
Sarah

 

[GarlicEater]

TSC sells a dust that I think is OK, it's with the chicken stuff.

TSC = tractor supply co.