Was just surfing Amazon and noticed they are taking preorder for some of The Black Series 6-Inch figures from Solo: A Star Wars Story.
These are sold and shipped by Amazon. At the moment there is a limit of 3 figures per order and the release date is 4/13/18. Be sure to select Amazon as the seller and not a 3rd party seller!
The rest of the wave is still listed as "This title is no longer available" from Amazon, but I assume they will begun to take preorders soon as well.
Not sure how long preorders will last at Amazon, but dont worry these will be at just about every major retailer next week on 4/13.
Remember you heard it here first!