Try http://www.isuzuparts.net
Pretty good prices. But if you email them to get a quote, be prepared to wait a week for a response.
Got a quote of $237 for the roof rack bars. Dealer wanted $380. List price is $312.
So what other optional factory accessories are there? I never saw a dealer brochure. The items I am aware of are:
1. Garage door opener
2. Roof rack
3. Floor mats
4. Nose mask
5. In dash changer (standard on certain trim & year)
Are the splash guards (mud flaps) I've seen in some of the picutres in the gallery a factory option? Part number?