You and Steve may be thinking about different kinds of spokeshaves. You're apparently thinking of a low angle spokeshave while Steve is probably thinking of a high angle spokeshave.
For a low angle spokeshave, you can't use a hacksaw blade because the hacksaw blade is too flexible. I have heard of people making their own blade using blacksmith techniques but other than that, I think most people buy one.
If you're going to buy a blade, look at the Lee Valley kits. They have an advantage for adjusting the blade over the Hock blades. If that doesn't make sense after you look at the LV blades, post and I (or someone else) will explain the difference in how the two blades work.
Go into the world and do well. But more importantly, go into the world and do good.