Do Not worry, nothing sells out anymore. Nothing. You are going to have plenty of time to grab this.
If you are in the US, there's absolutely ZERO reason to get this from HK unless you:
1- Bleed money and can't think straight.
2- Have to be one of the "first" ones to have it and post pics (completely meaningless and moronic).
1 and 2 X 100.
If you want it, and don't mind paying retail, go with sideshow. That's the earliest you'll get it paying MSRP.
Now, if you don't mind waiting, plenty of deals will come up. PLENTY. Some collectors can't actually afford these (specially those that get it "first" from HK) so they end up selling these things for way less than retail because bills can't wait. Also, plenty of others will be selling these Returns figures because BvS is around the corner, and the onslaught of figures coming are going to be something those people will want, therefore they end up selling others in order to afford them.
That is my plan of action IF I do end up getting this dollie. I now know better, and I've seen it MANY TIMES. I remember paying $300 plus shipping for Robocop, only to see it later go for $185 shipped by some poor soul on FB.
I know doing it that way hurts potential other figure developments, but as it is right now, I don't see HT ever touching other classic licenses with what's coming (see Alien, 66 Batman, Returns, etc etc etc)
Hope that helps.