Hi Robin, there is a pletora of info on this subject here on MLU, as I opened up a discussion regarding the subject early last spring.
If you are looking for these, you are better off to find used ones. If they are for display only it doesn't really matter if they are serviceable or not. My local guy here in North Bay can refill them as the company services CFB North Bay...
Brand new ones would scare you($$$$$$)
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