While I am one of those terrible people that loves hids even in a halogen enclosure I know I'm blinding everyone constantly so I chose to get hids for my fog lights (coming soon) and the best rated halogen bulbs for my normal use headlights (which are already very good).
I paid $22 Amazon prime
The stock bulbs are German made here's a link.
The replacement process is about 2 minutes with a flat head screw driver.
Passenger side first (it's easier)
1) wiggle plug gently up and down while pulling it towards firewall don't pull on the wires
2) carefully pry the rubber boot off the housing, I was able to work it off by hand and my key, screw driver would make it very easy.
3)unclip the metal clip holding the bulb in and pull it out carefully. Don't touch bulbs.
4) install new bulb and re clip, the h4 2 prongs point at the ground.
5) when re installing the rubber boot be sure you fit the bulb prongs through before sealing it to the headlight assembly.
6) reconnect and test.