I found this one particular site most useful among others for information about all types and brands of wheel center caps- http://www.hubcaps.org/freeadvice.html AND http://www.hubcaps.org/
You can find affordable wheel center caps on hubcaps-wheelcovers.com.
Wheel intovations is a great place to find wheel center caps. They they are very friendly and helpful and there is a large selection of caps to chose from.
Cheap center caps can be found at www.Hubcaps.com .
The first place I would check is at your local junk yards. Most likely they will have them. If you can not find them there you can try hubcap heaven. They have just about everything for your rims there. If they don't you can try Amazon.com and they should be able to find some aftermarket center caps for you.
Try upstreamcentercaps.com if you want custom center caps. Otherwise you can find OEM center caps on ebay for a good price.
One can find and purchase cheap Cadillac Center Caps from various websites like Amazon or eBay. Both websites offer a great amount of products, including a cheap Cadillac Center Caps.
They keep that under wraps as not all make it to market but you might find this of interest www.ptcruizer.com/news.html
Generally you will be able to find replacement center caps at the dealership. You can also pick them up at performance shops like www.summitracing.com.
You can find a very wide range of center caps at hubcapscanada.com. They have many makes and models for any kind of hub cap you need center caps for. You can visit their store at 5905 Gateway Blvd. Edmonton Alberta. Or phone them toll free.
Pueblo craigslist/autoparts.
Car lovers can find center caps for their Chrome Rims even if they are old. You can search websites like Ebay or Craiglist to see if anyone is selling spare parts for center caps or reach out to a dealer and ask for help.
One can find more information about AUT at the Auckland University of Technology's website or at the University information center. The university information center has the same information as their website but the university information center has advisers that can answer any questions.