I am seeking a product called HC1.  It is used to help one pass a drug
test.  The product is in liquid form and I am told its price is
approximately $80.  I am told this product is only available on the
internet.  My searches have only yielded a diet drug called
phenetramine HC1.

HCl simply indicates a hydrochloride salt. There are many thousands
such compounds.

As for passing a drug test, the only sure way is not to be taking the
drugs it identifies. Products claiming to ensure a pass, regardless of
what you do, are the modern-day equivalent of snake oil.

A lot of pharmaceuticals contain "HCl" (lowercase "L")-- hydrochloric
acid, available reagent grade your hardware store (or vomit-grade from
your own tummy!!).

I'm kinda curious what kind of drug test it's supposed to beat.  I've
heard of people putting bleach-products on their fingers.  Not sure
how you could coat your fingers with hcl.