OC Automation (http://www.ocautomation.com) had some in stock as of about a week ago. I was able to get one from them and they seem to have a a few more in stock. They show the ZCS000 on their website as well. This might be the last of them until the replacements come out. When I talked with ACT(Homepro) last, they were through Beta on their replacement units (ZCU101 and ZCS101), and they were taking wholesale pre-orders, but they didn't have a ship date. My guess would be mid Q4 of this year. Again I don't think there are any guarantees that they will work right off the bat.
Hope this helps.
-Pete