I've previously owned fashion brands where we wholesaled to the...

I've previously owned fashion brands where we wholesaled to the larger department stores as well as boutiques across AU,

The majors would want a 100% - 120% markup, boutiques you can get away with much less.

Not sure how the groceries stores operate but I'd assume it would be far greater then 3-5% as it wouldn't be viable for them. 

I have a client currently who wholesales 'health' products to coles, will ask what the mark up is next time we chat out of curiosity.