Just received notification from Amazon that they now have most of The Black Series 6-Inch Archives figures in stock as of this post. Get them while they last. Price is $19.99 each. These are sold and shipped by Amazon.
As of this post, Bossk is only being offered by 3rd party sellers, but here is his link if you want to check it once in a while to see if it gets listed at $19.99 from Amazon.