we purchased some egg knobs from Emtek (a good brand, according to a friend of mine who is a locksmith) from Simpson's Hardware. They're a small mom-n-pop business with good prices and they were very very helpful in figuring out what I needed. (I had previously ordered some Emtek hardware from a site that screwed up the order then proved to not know the meaning of the words customer service.) I've since recommended Simpsons Hardware several times on this site and everyone who used them was pleased as well.

Here is a link that might be useful: Simpson's Hardware

I nearly bought the Weslock Julienne but my wife nixed the egg knob idea. I got the same knobs in round and they look good and were reasonable priced. I also was shocked at prices and found handlesets.com to have a great selection and were fantastic to deal with. They have the best search filters I've ever used.

Here is a link that might be useful: Handlesets.com egg knob choices

You might try Simpsons or directdoorhardware.com.