Dead zebra was the main place to get them, they are sold out, and since series one was a limited edition, no more are being made. The only place to get them now is eBay, at ridiculous prices. DZ will be coming out with the standard green guy as a non-limited edition this fall, and they are hinting towards a series two in the future.
I tried and tried to get a random 4 pack of these, never did have any luck. I too was hoping for the one in the suit. :-(
I love these little figures...only one left to acquire to complete the original set...(apk). No hurry, especially since they are way over priced at the moment. These guys sit on my desktop at work, staring at me all day with there 9 sets of eyes.