Super 7 will keep pre-orders open until March 31st 2019. You have to order the full set before you can add individuals figures.
The Masters of the Universe William Stout Collection set of 4 figures is a made-to-order for $140 per set (plus shipping). Individual figures are available for $35 each with a full set.This pre-order is open until March 31, 2019 with shipping in Summer 2019.
preorder.super7store.com/products/masters-of-the-universe-collectors-choice-william-stout-collection-set-of-4