its expensive
oil shale
Nylon is not an expensive material.
or
no, it is expensive
is oil cheap or expensive
its expensive
Its expensive
Expensive, costly, precious, priceless, or valuable. Those are opposites of cheap.
expensive
expensive opulent, expensive, pricy, highbrow,
oil shale
Processing, mining, and waste disposal is expensive.
Nylon is not an expensive material.
Cheap
or
It isn't "cheap" but it isn't as expensive as oak.