PDBlock (Physical Drive [Write] Blocker)/PDB_Lite:
Price: $29.95 (Law Enforcement Price)/Free (Law Enforcement Only)
Click here to go to PDBLOCK's page
on the Digital Intelligence, Inc. site.
NOTE: PDBlock is no longer free, but PDB_Lite has been added and is free.

Safeback:
Price: ?
Click here to go to Safeback's page on NTI's site.
NOTE: Safeback is currently in redevelopment. There is no projected release date.

Hardware Bible, 5th Edition w/ CDROM
Author: Rosch, Winn L.,
Format: Paperback
ISBN: 0789717433
Pages: 1200
Publish Date: 9/1/1999
Publisher: Que
List Price: $39.99
NOTE: We CANNOT supply links to purchase this book.

In our courses, we have mentioned Computer Shows as a resource when funds (departmental or personal) are low
Two I have attended are run by:
Computer Central Shows held at the College of DuPage and Other Locations.
and
Computer Shows of Northwest Indiana
Price of admission is about $6.00, or $5.00 with discount coupon. Discount coupons can be obtained from the website or from getting on their mailing lists.

(LONG) IMPORTANT NOTE: Beware UNLICENSED software! (From ANY Source.)
In our classes we promote the use of DOS 5.0 through DOS 6.22.
You would optimally want to purchase a full version of DOS. However, this is not always possible. Here are two examples of less than full versions are their very different results.
 

EXAMPLE 1: Vendor has the manual only. It does, however, have the license (with the hologram)
attached to it.
Result: You are then legally entitled to use a copy of DOS. With this license, you can
obtain it from another source in the same way you would be entitled to make a backup.

EXAMPLE 2: Vendor has a full version on diskettes s/he manufactured with neither manual nor license.
Result: S/he is in violation of Federal Copyright Law. If you purchase this software (and use it).
You will be, too!

In our courses, we have mentioned some of these links:
Online Services List Contact Info.

ZDNet Downloads (A Good Resource for Utilities)
NOTE: if the above link gives you problems, Use this one, then click on "Downloads".

Federal Guidelines for Search and Seizure of Computers.
This link is one of many from Computer Crime and Intellectual Property Section of the Criminal Division of the U.S. Department of Justice

(Search Federal, State, Local, etc. Government sites.).

(Search .mil Military Government sites.).

(Search .edu Educational sites.).