I'm at 4 so far. I lucked into one of those Wal-Mart endcaps awhile back, and picked up three then (and they were all gone later that day). I have since picked up one additional one at Target, although the $12 pricepoint stung a bit. I initially set out to get 4, or maybe 5, so I'm happy - but there is a part of me that wants to pick one up each time I see one at retail. I think I've actually seen them on four or five different occasions, at WM, Target, and TRU - much better than the one single VOTC Stormtrooper I ever saw.
Also, real nice custom BARC troopers there. If I had that type of skill, I might attempt it myself. I hope that Hasbro utilizes the Scout mold and does that for us themselves. It would be great to get a figure of that trooper.