Would like to pick up from Lowe's instead of paying for shipping. Does this come in a box to assemble, or does it come as the full igloo?

It comes with 2 pieces the igloo top and the bottom base and it just snaps together.

Comes as full unit when I purchased at store. You may to snap it to base but easy to do.

It comes in two pieces, the bottom and the top. The flat bottom will fit in a lot of places and the main igloo can fit into some small places since it has no bottom. These are the best ever. During the winter I used to bring in my dogs if the temp went below 20 but one night my dog wouldn't come so I crawled inside and it was very warm. I put half a bale of hay or straw on the bottom so my dogs could make a hole and stay nice and comfortable.