There are certain items that you will have to order through the dealer.

I had to order a replacement sun visor after my wife smeared make-up on it accidently on Easter Sunday. I went through my local Body shop and got the part for cost. When you buy from the dealer you pay full retail.
But...
When your body shop orders it is a 20% discount.

Other than that, you may need to find a few junk yards and see if any H3's have made it in yet.