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NYC: The Strand
Portland (OR): Powells
Seattle (WA) Elliott Bay Book Company
Austin (TX): BookPeople
In Spain you can buy sea water at cheap price at any diet store and some supermarkets. There are 5 companies bottling and selling sea water because there is a lot of people drinking sea water on a daily basis.
If you at your country become a critical mass of people interested in sea water, companies offering it will arise.
So, it's in your hands, sharing this information meeting your friends, by phone or social networks, to make the conditions where these companies will appear and make sea water even more available to all the people.