FYI for OP, any coffee bean can be used for espresso. Some coffee roasters will make an “espresso” blend, but you don’t need an espresso blend of coffee to make espresso. I typically use a medium dark roast. A less oily bean usually gives me a better pull, but it’s not necessarily required. A fresh roast also usually pulls better than one sitting on the shelf for months.

Dave’s blend that they used in their espresso machines is Blind Pig.