You can buy them here but a lot of the pharmacies require a scrip.
I found a med supply company that's family owned and the lady there loads me up. They've got all sorts of stuff for handicapped and elderly people. The first time she even said, "I don't know what you're using them for, but I can get you a better deal if you buy syringes and separate tips." They're cheaper than all get out and the syringes and pins come in little solid plastic cases. Very easy to seal up when your done.
I ordered some amp openers from getpinz.com. They are great if you can't get your stuff locally.