Just trading

Hi, everyone. I can't really understand the town phase, I believe and need a little help. So, my players returned to Skogenby and they really feel nobody likes them there. They want to buy some snacks and get going. The grocery list is about 9D total, so how do I handle that? Do they need to throw dice until they get 9 successes? It feels like a lot of silver for some food and a flask of oil. What happens if they don't manage to find enough successes? I would be really thankfull for any advice. Also, excuse my English, I'm not native and don't have much practise.