Ah thanks, that wasn't clear to me. I thought you just used 1kg as a baseline unit. Since pricing is monthly, I suggested that shipping would be too and thought it was just a weird way to describe 500g :)
using coffee which was roasted over a month ago is probably a deal breaker for a lot of people who would use a service like this. Good examples of coffee websites: www.hasbean.co.uk www.yorkcoffeeemporium.co.uk