פירוש על דברים 28:68

באניות [AND THE LORD WILL BRING THEE INTO EGYPT AGAIN] באניות — the latter word means, in ships, i.e. He will bring you again into captivity to Egypt.

והתהכרתם, you will begin to manufacture or make by hand all kinds of goods the host country lacks in order to secure your economic well being, but

והתמכרתם שם, “and you will offer yourselves for sale there.” you will actively beg to be bought as slaves (an ultimate degradation of yourselves).
ואין קונה, “but there will be no buyer.” This is a promise by G’d who spares you this ultimate degradation.