Bicycle Mechanics - Where to buy specific cogs for DA cassette?

I am looking to replace the 21-23-25 triple Ti cogs. I put together an 11-25 cassette using a DA 11-23 by dropping the 14 and using my 21-23-25 from my Ultegra which has 5,000+ miles on it. I want to have the new setup for all 9 gears. Does anyone know where online I can order those upper 3 cogs from? I don't want to just buy a 12-25 cassette.

For those wondering why I did this, I plan on eventually using the 11-23, but for now still need the 25 for some hills. I also wanted the 11 for those times that I want just a bit more than the 12. :-)

Thanks

I think I have several extra Dura-Ace/Ultegra cogs you can buy for a reasonable price. I just need to make sure I have what you want.

edit: Just looked through what I have and I don't have any 21-23-25 clusters; sorry. Let me know if you need any 19-21-23 clusters though, I've got several of those.

http://img.photobucket.com/albums/v47/iareconfuse/DSC00909.jpg

http://img.photobucket.com/albums/v47/iareconfuse/DSC00910.jpg

Thanks for checking. Why do you have so many cassette parts? Do you know anyone else like you who happens to have that many parts laying around? :-)

You can try a place called Loose Screws online,he may have them.

QBP lists some cogs. Try your LBS. There may be an online version of the QBP catalog, but you can't order from them.

Thanks for checking. Why do you have so many cassette parts? Do you know anyone else like you who happens to have that many parts laying around? :-)

There was a random box full of cassette parts that the head mechanic at the shop didn't know what to do with, so he just gave em to me.