My monthly expense is around R5000 rand a month....

My monthly expense is around R5000 rand a month. Never have I gone out the shop with all my requirements. When I go to a similar shop they always have plenty stock and all flavours of the commoditate I am looking for. I run a small tuckshop at the retirement centre where I am and the elderly are so set in what they like and can afford that it makes it very difficult.I have tried different times of the month but it never changed. Now I have to make two trips to replenish the shop