Remember that Tash Switches are now vended by Ablenet.
Also if you cannot find a certain switch in the USA then check ATNAD or QED.
Interested in sequentail switches? Many folks think there is only one choice, but here are a few. Most come with levels standard or levels as an option, all have either a recording time or message number limit. All allow a sequential message to be played by pressing the switch top or an access switch attached to the sequential switch. Some allow the attachment of an external speaker for when you need big sound.