I use Howard Leights too, but I use the MAX 1's.
http://www.amazon.com/Howard-Leight-...ard+leight+max
or
http://www.amazon.co.uk/gp/product/B...?ie=UTF8&psc=1
They're comfortable, effective and inexpensive. I have a pack of 20, and I stash spares in various places so that I can't forget them. There's some in my jacket, some in my tank bag, some under my seat and some sitting on the desk right next to me (cos I occasionally use them when I'm working and need to REALLY concentrate).