I have been searching for days trying to find something like these pots, and I finally did. They appear to be made from the same material and process as a couple of pots I found on Antique dealer web pages. I am hoping to confirm. I had purched these pots from an Antiquities dealer who was importing from China. All of the other material he was dealing in had paperwork with it, and considering the prices of his other stuff, these pots seemed to be container fillers for him. He told me that he could get no more of them as they were either gone, or not available to him any longer. I bought all that he had. I have about ten pots in all that I got from him. I have included two other examples of what I found that seem to match what I have. Mine is the shallow pot with dragons, the other two are examples which match everything that I can see from the pics. Here is a link to the pot I am currently selling on ebay. The pots below are examples of similar.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140488634545&ssPageName=STRK:MESELX:IT
China Antique Green porcelian of Qing Dynasty 1644 – 1911