In the US, if you buy a car at the advertised price you're probably getting massively ripped off!

I figured THE base configuration are for corporate uses. Plain iron exhaust, no hubcaps, flat paint, manual air conditioning, multi band AM radio and the likes. Sales reps worldwide are driving in that configuration but dealerships that don’t expect business customers probably don’t stock them.

You can in most countries that have proper consumer protections. Cars in Australia are often advertised with their "drive away" cost which includes all state and federal taxes etc.