I take this RES 20 OHM 5% 5W AXIAL resistor and carefully crunch the square outside ceramic in a vice. Out comes a perfect 20 ohm smoke resistor. Since I buy in quantity, I only pay 29 cents for them, but even in quantity one they're only 50 cents.
Tip: Wear safety glasses when cracking the shell, you want to squeeze on the corners for best results.