i don't do limited editions because i grew up in the digital era in which original pieces of artwork are devoid of value, and don't do open editions because i don't screenprint or anything so that wouldn't make much sense. prints are available at the link above though!
Screen printing isn't too hard, and might add a lot of value to your plethora of tools. And I don't want to bicker, but if you integrate digital and traditional, you could always guard against counterfeits that way. Anyway, love your work, and congrats on your success with your magazine illustrations!