An idea: announced, incremental price decreases. Blades mine ~X per hour/day... price of each blade/USB decreases by ~X per hour/day.
Not a good idea IMHO. I'd find better to offer discounts for large orders, with these offers changing over time. Something along these lines. Little step by little step you can change pricing policy in a more subtle way than just saying "yesterday was 2.5, today is 1.5".