You could try Ascotts smallholding, but their delivery charge is quite steep. I try and restrict myself to a couple of orders per year, as size doesn't matter. I buy my Rockies one at a time when needed from local agri merchants, as my GG' never eat theirs, and BT's go through them quickly... but 10 would last me a few years... (and by them be dissolved ....). Cannot remember how much they are...