To AU, NZ, and UK formula feeding mums

I am from the States and have been researching alternatives to formula. I am EBF, but I want to be prepared in the future if something with supply happens because traditional formula is NOT an option for my son. (Not bashing any moms that do use traditional American forumula, I have 2 sons that after 6 weeks used formula until they were 1, but everything I have been researching is steering clear of it!) I have heard that your countries use goat's milk formula as an alternative and it is commercialized. Do you have any thoughts on either or? Benefits? Please share, I am extremely interested. Thank you so much in advance!