Take a look at this, it looks like a good deal to me what do you think. I have just paid £10 for some .25 micron diamond compound. I do not know how much compound is in each syringe.
I got my norton from these guys and the service is very good but little expensive.

http://www.rutlands.co.uk/cgi-bin/psProdDet.cgi/DKA122||@cLapping%20Compounds@b|0|user|1,0,0,1|9|