Was at WDW last week - was able to score the version with the Orange and Red markings on the black R5 droid to complete my set.
I used the "ship back to home" feature, I bought the ships over at the First Order Cargo store, and then took them over to Doc Ondar's and had them ship them home for me. We are DVC members so I was able to get the two ships for 20% off, which more than covered what Disney wanted to ship the two items back home.
They just arrived today and were well packaged. So I'm probably going to keep those two MIB (the Blue and White markings ones I got last year were shipped to me opened to save on shipping and packaging size).
Would be great if one day they released just a 4-pack of these four droids. I doubt that will ever happen, but based on the quantity of these on display at the First Order Cargo - I think they are almost sold through these.