People look up the object. A projecting sign, built-up letters, a light box, window vinyl: each one gets written out by somebody who saw it on another shop and wants the same, and a general page about signage matches none of those queries.
Prices are searched and hidden. What a shopfront sign costs is asked constantly, and a range with the factors that move it wins the enquiry from every competitor who insists on a phone call.
Vehicles are a different customer. A tradesperson lettering one van and a company liveries twenty are both searching, and neither of them is looking for a shopfront.
New businesses search early and buy everything. Somebody fitting out premises needs a sign, window graphics, menus and a vehicle, and reaching them at the fit-out stage means selling the whole set.