Product Niche in Australia ,Help!

Hey guys, I currently run a magento ecommerce site selling my own branded health sups (1,200aud in sales per week), I want to expand into a new niche product(physical) that I can sell, market brand with a good profit margin 30-50%. White hat meths only, if anyone is from the States pls PM me with a good niche that I can market here as AUS is usually 2yrs behind everyone else in regards to internet.

Thanks guys