There's a cast aluminum "anvil" type straightener that works pretty well. Don't remember where I got it. I'm sure it was inexpensive. It says
STRAIGHT 'N ARROW on it. No other marks. Update: I just did a quick search. Looks like it's not made any more. Can't put in link to *********** here for some reason. Now, if you're looking for home made, I guarantee that I could make one "like" the picture with a block of wood, two bolts, 4 nuts and a nail. If you really wanted to get fancy, get some nylon rod, drill it to put the bolts through and you'd have something a bit softer to bend your arrow against. I'd even suggest filing a flat on the nylon that goes over the bolt on the end.