Anything that you get from Divers Den, Vivid, etc. will be picked through already. If you can handle a whole box, then getting a whole box right from the diver is better. I was able to pick out what types of corals I wanted... and they waited a week to make sure that I got some of them.
Livestock usa does whole boxes of stuff... they are not really retail. They are not WYSIWYG... they are a semi-wholesaler that will sell to anybody. I get rock from them all of the time... it is cheap and quality pacific stuff when they have it in stock (no fiji shutdown).
Just know that most of these are going to 1). die, 2). just be OK, 3). be blah. If you get one star in the box, then you are doing well. These will test your ability to reef, especially at first. I would be at the top of your game with near-NSW parameters and the best lights if you want to do this... these are not yet filtered to do well with high nutrients or LEDs.