Don't eat the fender venison
Junkyard diving for the hood should get you one for a pretty decent price really - it's not like that's a rare car.
Those deer whistles are crap, but I've found what really works nicely is a set of those freaking bright driving lights PIAA makes. They light up EVERYTHING and it's pretty easy to see the light reflecting off the deer's eye. And if you get the 1100X, they're 55watts which means it's legal to have them on WITH the low beams. I don't recommend this for regular driving, but I'll admit when I'm in heavy deer country, they stay on.
Main drawback is that the fake tuner crowd sees the lights, thinks I'm one of them, and wants to drag race me in traffic