As Mike has noted, you can get them at your local drug store. Lately however, I've noticed the local drug store has stopped stocking them in bulk, going instead with packets of two or three which really runs the price up (I bought a packet of two a while back and it cost me $2.79). If this is a problem with you (it is to me) and you live in or near to a larger town, check in the Yellow Pages for a hospital or medical supply store. They stock in bulk and it's a lot cheaper. Also check your LHS and see if they stock Testors paint syringes. They're larger than the "eyedropper" syringes you get at the drugstore, but work equally as well.