I think they generally have MAP pricing and it is almost the same whereever you go... unless you're paying for tax and/or shipping. I generally her Eno's shop as being the cheapest.
The link Fuhrman posted.
Looks to be same price of bite the bullet...
I would get in contact with Andrew at Profire Arms and Supply. He is in the Site Advertiser section.
brianenos.com is a dillon retailer and does free shipping. thats probably the cheapest you'll find
Talk to Mark @ Bite the Bullet gun shop in Seymour. All the dealers sell MSRP. Mark has it in stock. You have to pay tax, but you can check it all out in his shop.
Rob
How much are you planning on spending? Are you trying to go for the most basic dillon setup or deck out your press? I know I wouldn't want to pay tax on the $1300 I spent.
To the OP. I have a 550b and am reloading 3 calibers. My first order was just over $900 and the second order just over $400. That did not include the price of my caliper, scale, tumblers, or dies, which I bought none of those from dillon. If you'd like to check my 550b out, let me know. I have all the upgrades minus the casefeeder.