Best deal on tires?

I need new tires to get my car to pass inspection. The past few years have been tough and I've been getting by purchasing used tires. I'm finally at a point where I can afford to buy a whole new set and I have no clue where to go.

Does Discount Tire's road-hazard warrantee make them a good deal?

I have access to a Costco membership.

I'm looking for the overall best deal that includes putting the new tires on, disposal of the old ones, alignment, etc. A road hazard warrantee is nice, but not an absolute requirement.