I've never ever seen 4 oz water bath canning jars. So I went to Google, and lo and behold, I found these: http://www.lehmans.com/jump.jsp?itemType=PRODUCT&iProductID=184 and http://www.homecanningsupply.com/pages/webcat19.htm
as well as this interesting page: http://www.solutions.uiuc.edu/factsheets/FP02_07.pdf
So it looks like you should be able to order them on the web, if nothing else.
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http://www.lehmans.com/jump.jsp?itemType=PRODUCT&iProductID=184
and
http://www.homecanningsupply.com/pages/webcat19.htm
as well as this interesting page:
http://www.solutions.uiuc.edu/factsheets/FP02_07.pdf
So it looks like you should be able to order them on the web, if nothing else.