I get the surgical ones, maybe because my wife is in the medical business. But here is a link to buys some.
http://www.scissorsales.com/moretweezers.html
I found they last longer than the hobby brand, in fact I have never had to replace them. The one I use most is the Fine micro tapered tweezers 3" long stock #16-30
I use a rubber band to clamp down and hold them closed, that way I can adjust the tension without breaking a part.