Refugee Center Food Broker

So, the door merchant is about to get his bartering skill artificially buffed so that he pays roughly 40-60% of what he would normally pay for an item... on top of that the total amount of cash he starts with will be nerfed.  It is a bit too easy to drop a single awesome item you are never going to use and in return clean house in the shop.  To have a steady income, the Refugee Center is always willing to pay face value for the renewable nonperishable food stuffs.  The broker is in the back office room and will tell you want he is looking to buy but you won't have the option to deliver it unless you have it on you.  The idea is to encourage/make viable an industrious farming/fishing/harvest moon occupation.  

Need some suggestions, what are the main nonperishable staples he should be asking to buy?  I'll probably be adding:
-beer, you can grow hops and stuff I think?
-sugar, can you actually find sugar beet seeds?
-flour