Ned the best prices on Miller are almost always from Indiana Oxygen Supply. I believe that they are Miller's single largest distributor.
They sell on Ebay here:
http://stores.ebay.com/Welding-Supplies-from-IOC
They will provide everything you need to submit your info to Miller for the Build With Blue Promotion. The promotion was also going on last year when I took advantage of it as well. Free shipping and no tax, etc.