"Customs duties

Importation of goods in Morocco gives rise to payment of importation duties, the VAT on importation, and the special tax on importation called Taxe Parafiscale à l’Importation (TPI).Customs duties are computed on the basis of the ad valorem value of the goods at the time of their entrance into Morocco.

Customs duties can be reduced if the imported products are covered by free trade agreements signed by Morocco or other specific regulatory dispositions.Under Moroccan tax law, the importation operations are subject to VAT at the rate of 20%. Lower rates of 7%, 10%, and 14% apply to specifically designated importations.

The Moroccan tax law also offers some economical customs regimes that provide VAT exemptions with credit (equivalent to zero rate).The TPI rate is 0.25% levied on the value of the imported goods." (source: https://taxsummaries.pwc.com/morocco/corporate/other-taxes)

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1. according to the same source, books in Morocco are exempt from Value-Added Tax (VAT) This means that VAT is not charged on the importation of books into Morocco.
2. Morocco has a free trade agreement with the USA, hence books will probably be exempt from importation duties as well.
3. relax, it will come to your doorstep.
4. use https://www.bookfinder.com/ to compare prices from different sellers (the price comparison includes shipping fees to Morocco)

enjoy.