If you need to substitute, you can use All Purpose Unbleached Flour to approximate 00 flour. For Fancy Durum Flour I substitute Bob's Red Mills Semolina Flour which my local grocery store carries in the health food section.
These are good questions though. I added something about both to the Fresh Loaf Handbook.
No, Durum flour is made from durum wheat, 00 flour is an Italian designation for a fairly soft wheat flour used for making pizza crusts.
King Arthur's sells versions of both:
http://www.kingarthurflour.com/shop/detail.jsp?id=3338
http://www.kingarthurflour.com/shop/detail.jsp?id=3480
If you need to substitute, you can use All Purpose Unbleached Flour to approximate 00 flour. For Fancy Durum Flour I substitute Bob's Red Mills Semolina Flour which my local grocery store carries in the health food section.
These are good questions though. I added something about both to the Fresh Loaf Handbook.