I agree! You have to be careful with the shops. Many of them say they have deep discounts but all they really do is raise the retail price so it "looks" like they have a good deal.
Here is a good site for Moda cuts: QuiltersBiz.com There bundles, jelly rolls, charms and layer cakes are always 20% off.
They have a special going on right now with a 10% off coupon. If you use coupon code QUILTMKT1008 during checkout you get an even bigger discount.
This is my favorite site... their service is very good... usually ships same day.
Hope that helps navigate the sea of shops out there...
Cat_the_quilter