I'm so broke I can't pay attention.
If I had his money I would burn mine.
Aint' worth a plugged nickle.
I ain't got a thin dime. (I never heard anyone say that they had an obese dime)
You got to fish were the fish are.
Keep yo powder dry.
He ain't worth a egg sucking dog. Meaning he is worthless.
Don't jump out of the frying pan and into the fire. (remember this the next time you fry frog legs)
Here's one for the folks farming in Wire Grass regions....
Sift your meal and save the brand, cause you can't make a living on sandy land!
Y'all come on over for dinner, we're going to have a rat killing!
It ain't worth the wear and tear on the old hen's ...behind. (meaning it's a piddling business)