Pharmacies usually carry the smaller ones (5 - 10 mL), but I think you'd have to get real lucky to find a 30 mL or 60 mL one at a pharmacy. If you know anyone that works in a lab, check with them and you may be able to get one for free. I got mine when I still worked in a lab where we filtered water out in the field. They'd wear out over time and become difficult to use for our purposes, and my boss would let me have the used ones.
To my surprise, you can buy them on Amazon.com... If you search "30 syringe slip" or "60 syringe slip" under Medical Supplies & Equipment, there's listings to buy as few as 1 to as many as 160. The "slip" part is for the slip style tip (which the pix themselves are not of -- they are generic syringe pix). The slip style tip is the kind that airline fits over nicely.
