Definitely not just insulin syringes. You can sell pretty much any standard needle/syringe, including for IM injection (with the caveat that different states may have different restrictions on what a pharmacist can sell without a prescription). I don't specifically have experience selling tuberculin syringes, but a quick google search shows that you can buy them online without a prescription, and I don't see the "Rx only" marking on the boxes. There might be some specialty needles/syringes that are Rx only, but for the most part, there are a variety of syringe sizes and needle gauges and lengths that are available without prescription.