The price of USB flash drives varies on capacity; the larger the capacity, the higher the price. But USB flash drives with large compacity have significantly lower unit prices than smaller ones. Take a look at some of the popular USB flash drives on Amazon. You will easily notice that the unit price of a USB larger than 64GB is around $0.02~$0.17/GB. However, a USB with a capacity smaller than 64GB unit price ranges from $0.19~$0.67/GB.