I'm not sure if the one we bought has a sip puff solution but you could email the company:
http://www.lpaccessibletechnologies.com

I know this place has sip puff solution but the pricing is crazy and confusing on the website. Best to email or call these guys:
http://www.broadenedhorizons.com/rec...n/video-gaming

Not many are made, so that equals a high price. If I had time to make my own I would! A Google search will bring some instructions up if needed. Also check websites like www.instructables.com etc.