sorry. I don't have that link.. the main post was either about usefulness of internet or about secret behind most successful people in tech - not sure which one precisely.
Google Compute Engine has sustained use discounts: the longer you run an instance, the lower the price per minute that you pay. If you run an instance for a full month, you end up being charged only 70% of that instance's price. Essentially, it's like AWS's reserved instances except you don't have to plan for it ahead of time.
That's actually a good idea and something that removes the need to create a marketplace for reserved instances you no longer need. Thanks for the info!