Inverted LED driver circuit
simulate this circuit &ndash; Schematic created using CircuitLab

The 3.3V comes from a regulator for the LEDs (one required). If you reduce the positive rail on the op-amps to +8V or so you could use quad LM324 op-amps and avoid the diodes, so total 8 parts (4 LM324 + 4 resistor networks) + 2 regulators if you use x4 resistor networks. Plus the LEDs. 

That's about $0.03 USD per driver and 0.5 parts per driver (not counting regulators or LEDs) in 250 unit quantity- Digikey list price. 

Note that inputs are high impedance and can withstand input voltage from a bit below the negative rail up to 32V.