These data are accessible from several sites, and are of varying vintage, including a reprocessing of data needed to fix a bug in the ARGO data handling system.
Some of the sources I have may overlap, so I am depositing them in a single large "ARGO" directory.
The original sources are:
ftp://ftp.nodc.noaa.gov/nodc/archive/ (This an archive of I believe uncorrected data.)
I know of ARGO because of my interaction and support of Woods Hole Oceanographic Institution (WHOI), which helps maintain them as well as build and launch some, and collect some data.
Late addition ftp://ftp.aoml.noaa.gov/phod/pub/ARGO_FTP/argo/.