Help with car parts (the thing that's on the wheels)

[vjacqb]

So I made the mistake of asking my brother what he wants for his birthday, because he told me he wants "the aluminum die-cast cover for his Alpina softline wheels R 20" complete with keys". My brother doesn't really speak English, so I have to make the purchase, but I have zero clue on car wheels and what the hell this thing is... He doesn't want the entire wheels (because that would definitely break my bank) but just this little symbol thing that goes in the middle of the wheel, covering the wheel bolts, complete with the key. Here's the closest picture I found:

My question is how much do these things run here? And what is the correct terminology for it?? Is my brother's terminology right?

 

[Mrs. Garrison]

i think those are called "center caps"

i will have to do some looking around and see if i am right or wrong

 

[kingofsorrow]

they're called center caps, and ebay should have them pretty cheap.

 

[vjacqb]

Great! Thanks for your help!