Getting ferric chloride from Radio Shack is getting problematic. Is
there a common household chemical that I can use for etching a circuit
board or two? I seem to remember Jim Weir having an article about how
to do it in the not to distant past, but I can't find anything about it
in my back copies of Kitplanes.

RS seems to drift farther from their name with each passing day.

However, there are electronics parts suppliers in most urban areas and they
should have it in stock, along with a variety of circuit board blanks,
circuit board kits, and "breadboarding" kits. Try electronics, electronics
parts, and electronics supplies in the locat yellow pages. Usually, in that
sort of business, "professional" or "trade" means that you know the name or
description of what you want to buy.

Peter