I got a load of syringes and needles from my local vet. I got 1/2ml to 60ml syringes and several larger diameter needles and blunted them myself I live in a small town so a rural vet might have more variety of stuff.
I just went into the vet and showed them my setup and what I wanted the syringes and needles for, they were more fascinated with the fact of quitting smoking and my educating them on ecigs to really care bout syringes I was buying.