EcoTools are available at massmarket retailers like Target and ULTA. The brushes used in this tutorial can be found at this on-line store. It's the most complete set of the brushes that I found on-line. Notice that some of the brushes (the bronzer brush in particular) are not available in the sets.
Disclosure: I once received a free set of brushes from EcoTools. You can read my EcoTools brush review to see how I liked them.