Help please? what is the cheapest source of chlorhexadine cleansers like hibiclens?

Use generic brand: The generic name for Hibiclens is Chlorhexidine gluconate. The likely cheapest source is on the internet, but be careful and use a reputable company- just look for "4% Chlorhexidine gluconate" for TOPICAL use (note that less concentrated forms of this is sometimes used as a non-alcoholic antibacterial mouth rinse). Read the packaging of generic products like "Wallclens", "Hibitane", and others.