With the IH, you can still get a lot of parts directly from case.
I used Messicks (
www.messicks.com). If you click on the CaseIH icon at the upper left, it will pull up a catalog page where you can enter your model and find parts. Going through Messicks, you get pricing - the same catalog is available at caseih.com but has no pricing.
What I did was get the part number I needed, then pop that into Google and/or ebay. If someone has a non-oem equivalent, chances are that the OEM p/n will be in the description, or if someone has a used one, that will show up.
Can't speak to the White.
I also used
www.steinertractor.com - sometimes a bit pricey, but they have a great operation and a lot of stuff in stock.