None of the Walmarts around me ever got in the Scarif/Cassian wave and only one ever seemed to have gotten in the Deathtrooper/Jyn wave - but at least in good enough quantities that I was able to pick up what I wanted.
I ended up just buying the Cassian figures I wanted off of wm.com and having them shipped to my local store. That worked out okay.
Like Rob though, I ended up buying two Scarif Troopers off of eBay to the tune of $25 each - that stinks. I'm hoping that more hit and I'll be able to buy more easily, but, in case that never happens, at least I have one to keep MIB and another to open.
My "fear"/concern is that with the changes to the look of the line coming for the 40th anniversary, I have to wonder if future waves of the WM exclusive Black Series line will even be packaged in the same way - so the Scarif Trooper may appear as a carry-forward in the next wave, but who knows if it will be packaged the same.
If only my local stores had gotten Wave 7 in the same numbers they received Wave 4 - maybe if Phasma has more of a role in EP8 they'll have an easy time getting rid of these. I have no idea where all the TFA Han, TFA Leia and Finn figures are gonna go though...