SMC provides all pneumatic equipment, correct (the FIRST contact for pneumatics is
HPE)? That'd be a good place to start.
However, what I would definitely do is first go to another team and ask them about it. Most teams would either trade, sell or even give you stuff like that if it's for a good purpose, depending on their circumstances with pneumatics. I wouldn't be surprised if your team had one lying around. If you like, I can make some inquiries on my team, though we are in... uh, Canada.