Publisher: Tcl Association Press
Publication date: 2008-2012
Prices:
Order online at the shop at LuLu .
Publisher: Usenix
Publication date: 1995-1998
Price: varies from year to year
WWW book information: http://www.usenix.org/
Usenix prints the proceedings from each year's Tcl/Tk workshop.
Note that individual papers from the proceedings are available, for free, from the web site above.