You can sometimes get sulfur powder at a garden store such as Southern States, but it might be easier online. Just mix it with vaseline. Nustock is also online or in the horse aisle at a feed store. Here is a link:
https://www.chewy.com/nu-stock-pier...6TMq9IJVPdMKs2sgbLdTFX29Z3WgFmEWZhZwz0DqePx34
You can order sulfur powder to pickup at TSC if they don’t have it:
https://www.tractorsupply.com/tsc/p...asYRyiSBMLA86tW3xdNb3l3o1r6iaE_ekKt1n_4W0mVPE
https://www.chewy.com/nu-stock-pier...6TMq9IJVPdMKs2sgbLdTFX29Z3WgFmEWZhZwz0DqePx34
You can order sulfur powder to pickup at TSC if they don’t have it:
https://www.tractorsupply.com/tsc/p...asYRyiSBMLA86tW3xdNb3l3o1r6iaE_ekKt1n_4W0mVPE