BarnesandNoble.com has the shared Exclusive Black Series 6-Inch Clone Commander Wolffe in stock and ready to ship as of this post. Price is $19.95 plus shipping. You can also use their "Check Store Availability" tool to try and local this figure at your local stores if you prefer as well.
Also ShopDisney.com is taking preorders on this shared Exclusive. Price is $19.95 also, but currently they state a estimated ship date of 9/3/18 ouch!