Several years ago, the medics in my Guard unit were instructed to dispose of any and all scapels in their field kits. So I ended up with probably 1500 to 2000 scapel blades (#11 & # 15) and several handles. As they're somewhat cheaper than Exacto (at least for me, I use them quite alot. Also use hemostats of various shapes and sizes along with a bunch of dental picks.
A couple of items I use that are possibly not actually considered surgical "tools". The first is a plastic cup made out of polyethene. It's used to despense medicine in hospitals and nursing homes, about 1 1/2" tall, same diameter at the top and 1" in diameter at the bottom. The sides are graduated in Tablespoons (TBS), Drams, Fluid Ounces (Fl OZ), Milli Liters (ML) and Cubic Centimeters (CC). They're great for mixing paints and epoxies. And if you turn them over (empty of course) you'll find a concave area about 1/2 " in dia. and 1/8" deep in the center which is very nice to dispense CA into. I origionally found them in a hospital supply store in packets of 1000 for $10 or about 1 cent each. In the past couple of years I've found them in Hobby Lobby and some LHS, costing 2 to 3 cents each in packets of 50. Use em and pitch em.
The other item you can't buy but if you ask the right person can get a rather good supply. It's sheet lead. About 20 years ago, FSM had an article on using sheet lead to create more realistic cloth items on models. The article its self was largely about using the thin lead sheets that some wine producers seal the corks in the bottles but it was also recommened that you might check at an x-ray lab for thin lead sheet. A couple of days later I happened to be at the dentist's office getting some x-rays. I asked the dentist's assistant who took the x-rays what she did with the lead when finished and she replied they put them in a box and when the box was full, disposed of it. When I asked, they gave me the box (probably 20 to 25 lbs). (When I went home and showed my wife my latest prize, her biggest worry was germs - so I broke out the camping stove and an old aluminum pot, went to the patio and boiled all the sheets - weird way to spend an afternoon.) I've still got about 1/2 of the origional box and use it to make seat belts, straps, tie down brackets, blast shields, web gear and various other items over the years.