one copy ubuntu 11.10 CD, where?

I would like to buy one ( 1 ) copy of ubuntu 11.10 on CD. I already donated $25. What else? and Where else? Thank You.
Pepe

I have been misunderstood and I apologize for whatever. I know where to get five CDs. I also know where to get 25, or 100 etc.
I also know of downloading the OS.
That is not what I am looking for.

I had one copy of 8.04, and one copy of 9.04 and I have one copy of 10,04 and they have all worked just fine in their time. I am not running any kind of business.

I have heard that you cannot buy just one copy. Perhaps there is someone out there that can enlighten me.
Please