I put pex in our shop also. Worked great, and I think it looks pretty nice. There are several places you can order pex and all the fittings.  I think I ended up getting my crimper off of amazon.  You will be surprised how handy it is to have  that crimp tool to fix water lines also.  I ran 1", then adapted down to my airhose at the bottom of each drop.  Would highly recommend doing this, it's way cheaper.  Also very easy to expand your system or "splice" in somewhere to make changes, if something isn't the way you like it.