i try not to keep track actually. i put a specific amount of cash in my wallet at the beginning of the shopping day and when that's gone, i'm done. i don't spend very much unless i've specifically saved to buy something expensive. i can't stomach shelling out large sums at one time in one store. however, if you were to add up all my 50-100-200 trips in the month....well, that's exactly why i don't.