craftgrrl | Good roving suppliers?

Well, I thought that I would ask here, instead of the knitting community, as I know a few spinners exist here...
I am going to learn how to spin later on this summer for my Senior Project in school. Do you guys ahve any favorite roving suppliers? I think I will try out a few different types of roving (I already know I will have alpaca, from the farm I'm learning at <3)
I don't mind more expensive ones, for later on, not just this project, as I plan to keep this up ;D
Just places with a lot of color is all I'd like!

Thanks in advance, and have a nice day!