Last year when I went through grad with three of my sisters, we decided to get them made. They are going to do it again this year. The stoles were made to our specifications - we choose stole color, embroidery color, and the symbol. (The owner faxed me a sheet of all the roses they had and we choose the best one) 
They were made by 
The Sash Company 
and look like:
and I think we paid something like $35... and they are really high quality!