Looking at your circuit, you'll need a beefy inductor there. Maybe not much, but Radio Shack used to sell those axial 200uH inductors rated at 2A. Alam ko meron ako dating ganyan na di ko nagamit, I'll try to look for it. If I find it, you can have it.
Or you can wind your own, as motion55 said di masyado critical yung inductance. If you have access to Alexan AC2000 DMM or any other DMM that can read inductance you can easily wind your own.