See Sources and Related Links below. Standard is less than $10. Upgrades are usually $10-$30 per bulb.
#9006.
You will need to take the complete headlight assembly loose or out to get to the bulb to change it.
Bulbs are replaced from rear of headlight. See answer to similar questions for how to do.
Pull the complete headlight assembly out to get to the bulb.
I've got a better question, why is this question in the Chevy venture forum ?
The new bulb is simply plugged back in after it is installed.
Remove the entire head lamp assembly
Could be a fuse or the wiring in the car
You will probably have to take the complete headlight assembly out or loose to be able to get to the bulbs.
Pull the complete headlight assembly out to get to the bulbs. You first have to pull the front bumper off, along with the wheel well to get to the headlight assembly.
The bulbs unscrew from the back of the light assy. sometimes you have to remove it to get to the back.
When you open the hood look above the headlight for two round plastic caps. Pull these upwards, it releases the light assembly.