GamersGate offers Steam downloads of Goat Simulator for Windows, Mac, or Linux for $2.50. That's slightly under our May mention and the lowest price we've seen. (It's currently $3 under the lowest price we could find for a hard copy.)

Also available is the Goat Simulator GoatZ DLC for Windows, Mac, or Linux for $2.50. That's $2 under our May mention and the lowest price we've seen. (It's also a current price low by $2.)