I think that school textbooks are exorbitantly priced.

It is not cheep but there again it is not exorbitantly expensive either, it depends on where you want to go/do and the quality of accommodation/facilities you are after.

The average cost of an apartment in the United States depends on its location. For example, an apartment in Tucson, Arizona can be very inexpensive, while an apartment in New York City is exorbitantly expensive.

Our family lives far off the road, so having comcast run the cable would be exorbitantly expensive. Could we hang the cable from telephone poles, or would that cause signal loss?

The price of diamonds means that lining a furnace with diamonds, sufficient to accomplish the task of insulating the furnace would be exorbitantly expensive.

The other issue would be diamond's extreme hardness: it would not be possible to form the diamonds in such a way to conform to the interior shape of a furnace.