My firewood pile. The grain orientation on new hammer handles is often terrible. Make your own. Cheaper better, be proud of your handy work.
Sears has Vaughn made handles with the craftsman logo here, they seem to be pretty plentiful
Never even considered that great idea! Assuming you rough cut with a bandsaw and finish with Spokeshave? I don't own a Spokeshave, LOL...
No saw. You split it with a dull hatchet. The split follows the grain. You end up with super strong, light, splinter free handle with a springy quality you can't get any other way. Shape with a rasp if you don't have a shave. You can get a lot done if you sharpen your hatchet.
Ash, pecan, hickory, are all excellent. White oak will also work. I'd skip red oak.
No saw. You split it with a dull hatchet. The split follows the grain. You end up with super strong, light, splinter free handle with a springy quality you can't get any other way. Shape with a rasp if you don't have a shave. You can get a lot done if you sharpen your hatchet.
Ash, pecan, hickory, are all excellent. White oak will also work. I'd skip red oak.
I wouldn't buy online, as you really need to have a look at a handle before using it.
This forum told me to go to www.househandle.com. I bought a dozen handles from them.
I second this. Grain orientation is key.
How do you hand pick a good handle? Do you look for diagonal grain orientation and as old growth as you can find??
My firewood pile. The grain orientation on new hammer handles is often terrible. Make your own. Cheaper better, be proud of your handy work.
How about from some milled lumber? I'm pretty sure I have a few boards left over from my kitchen. I used hickory for the face frames and doors/drawer fronts. So sap wood, huh? Wouldn't have expected that.
I would try a Blacksmith site. Hammer handles take a real beating. Here's my local supplier, http://www.centaurforge.com/Hammer-Handles/products/105/
The Jim Poor handles and his tools are highly respected by many Blacksmiths.
http://www.centaurforge.com/Jim-Poor-Replacement-Driving-Hammer-Handle/productinfo/JPDHH/
There are many Blacksmith suppliers that sell handles.
So long as your lumber is thick enough that would work wonderfully. I'm told a belt grinder is the animal for shaping handles if you have access to one. The slack belt allows for quickly setting the curves you want, provided you want smooth curves on your handles. Some who make their own handles leave the shaft deliberately squared, often with tactile markers for direction, so they can quickly switch faces without having to worry about striking using the wrong one.
Those are blacksmiths though... so if you aren't worried about striking while the iron is hot it may not be a concern. You might like the feel though. Personally I like a larger round handle, but to each their own.
I used to buy from Househandle. The last one I got had a crack in it and they won't respond to my requests for a replacement after I sent them the pictures they wanted.

Sapwood makes the best handles. That's the younger growth on the outside of a given log, nearest to the bark. All wood in a tree aside from the layer directly under the bark is already dead and it's best to use the "freshest" wood you can get your hands on. Light in color and away from the heart. Grain orientation is, at least in my experience, slightly less important. Important yes, but so long as the grain is running the length of the handle with no sharp interruptions where the handle meets the eye of the hammer I have had good luck.