Jewlz, if you get really desperate, try goodnessdirect.co.uk. They have black beans, too. 
Oh I ADORE Goodness Direct! We do all our bulk food shopping with them, as unlike Costco, they sell really great organic basics, and not just branded junk food (yeah yeah I know Costco do fresh produce, too!). Off the top of my head, we get bulk oats, museli, dried fruits and nuts, Rocks organic cordial, shampoo/conditioner, eco washing up liquid, cases of Nakd bars, oat meal (oat flour), bran cereal, rice, soya, and brown lentils.
We keep everything in huge tupperware containers in the hold, and decant into glass jars in the kitchen. So when the jars are empty, we only have to fill up from the big containers rather than go out to the store and end up buying ten extra things that looked pretty.
