The blocks will be ~8.5" finished.
http://www.quiltingboard.com/t-103507-1.htm
You'll have around 24 (or 28) different fabrics.
They probably cut a 1/3-1/2 yard of each fabric.
That's easily $75+.
Unless you're making it from stash, you're not going to be able to do it for much less $$ when you account for time, etc.
And they've done all the work by choosing the gradations. .
Plus the cost of the pattern (or the magazine), unless you've figured that out already.
You'd have enough extra for the binding and you can use the leftovers on the back.
You could try to make it from some of the Benartex Gradiation fabrics (and possibly get away with less fabric):
http://www.bryerpatch.com/cgi-bin/St...4.s0&lastmenu=
Or some similarly ombre striped fabric.
Call them and ask how much of each fabric is included.
They sell the dimples for $8/yard.
Easy enough to figure out how they do their pricing.