I've found 12-volt supplies in thrift shops - quite often an old Radio Shack product. In some cases with variable output. You could also use an un-regulated supply (a 'wall wart') that you should be able to find in the same place for just a couple dollars. Combine with a terminal strip and even perhaps a small project box.
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu