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You'll find a list of tank manufacturers here: http://cngchat.com/forum/showthread.php?t=3410
Forieng manufacturers may sell tanks that are not certified to US specifications, so be aware of this when looking for a tank. What is the application you are interested in? Personal use? Adding to your current vehicle for extended range? If so, there may be other options for you.
You have been give some good sources. As was mentioned earlier, some are not made to U.S. specification (most mentioned are). Please make sure if they are to be used in the U.S. they meet Federal Motor Vehicle Safety Standard (FMVSS) 304 found in Title 49 Code of Federal Regulation (CFR)section 571.304 and the NGV-2 (Naural Gas Vehicle) standard.
Faber, from Italy has also made some cylinders to both of the above U.S. standards