Hi,
Usually those prices are for genuine cadmiums, cobalt, ultramarine and vermillion, to name a few.
Try the brands Winsor & Newton, Rembrandt, Lukas and Old Holland.
You may check these direct links :
http://www.dickblick.com/categories/oilpainting/
http://www.aswexpress.com/discount-art-supplies/online/9
And don't forget to buy some decent brushes.
Better few and good than alot and bad.
A tip : usually beginners tend to buy smaller brushes than they should.
Kind regards,
Joséhttp://theartinquirer.blogspot.com