Again, drop bolts are extremely simple, if you've got a drill, measurement tools (especially a centre punch for making an indent so the drill doesn't wobble around) and a hacksaw, thats all you really need to make them.
If you live in America you could try Harris Cyclery, they have an excellent array of brakes, loads of longer reach too. I was going to buy a new front brake on my bike but postage is way to high for UK and i don't think they even do postage to here anway!
Sam