I was lucky to see the sale for the Rice Wine Shop (pictured, Brewer St, nr Picadillly tube) Eat good Katsu Curry here for as little as £7,

 natural natural (Finchley Road tube or Ealing Common tube) and TK Trading (near Harlesden  will have fresh items as well as the Japanese staples/ look for  sales in the Weekly Journey: online or pick up at Japanese stores or sites.

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Cheaper supermarkets such as Lidl now do stock some staples, and are worth comparing; Korean shops are often good value for instant and frozen Japanese items or snacks.