Try a google search or AWSwelding magazines, inspection trend Mag.
mdk

Depending on what you need, you can get it from your local drug store.

This may help.
http://www.aws.org/cgi-bin/mwf/topic_show.pl?pid=33548;hl=macroetch#pid33548

If you know what etchant you want just g to your local chemical supply store and they will have it or can order it for you.

MIGGUN

Forget about a local pharmacy.  Forget about your local chemical supply.  Forget about Fischer Technologies.  They all have stopped selling stuff to individuals.

PACE Technologies
3601 E. 34th St. Tucson, AZ 85713
Phone: 520-882-6598 FAX: 520-882-6599
email: pace@metallographic.com
All Rights Reserved.Copyright © 2008
PACE Technologies
3601 E. 34th St. Tucson, AZ 85713
Phone: 520-882-6598 FAX: 520-882-6599
email: pace@metallographic.com
All Rights Reserved.

I found this, but I haven't called them yet.  I don't need anything right now, so I do not need to call them.

Joe Kane

MIGGUN

Here is another source that says that no order is too small.

http://www.chemical-supermarket.com/Phosphoric_Acid%2C_500ml-p160.html?gclid=CNrp5IKb2pUCFQFqxwodPWQ7YQ

Joe Kane