“We’re cool for the summer,” sang Demi Lovato in a song that is definitely not about, as some scurrilous pop culture commentators would have you believe, smooching (or WORSE!). No, Demi is singing about paying full-price for video games. It’s cool for the summer but what then? What comes next? The answer is: the Humble Store End of Summer Sale. They’ve got over 3,000 games on sale and right now they won’t let you pay even a penny for Tropico 4 – the dictatorship-building sim is free (as a Steam key).