I ordered it a couple days before my trip. I called the Boardwalk and asked for in-room dining.
I told them when I wanted it delivered.
It was $50

but so worth it. It is sold chocolate by the way. It came with a card from Mickey so my kids thought it was a gift from Mickey welcoming us.
You can get the statue separate from the strawberries to save some money. I think the statue might be $25?? Can't remember.
Not all resorts offer this. You'd have to call to find out. I know BWV does, BC and I think the Contemporary and GF do. Other resorts like AKL have their own special chocolate things. The resort can help you figure out what to order.
Some of the special things you can get from in-room dining are listed at
www.wdwig.com under the menus section.