You can buy the Kindle version of Frs. Rumble and Caty’s three-volume classic of Catholic apologetics, Radio Replies, for $0.99 on Amazon. Unlike many cheap deals for the Kindle, it’s formatted and type-set very well. There’s also a preface from Archbishop Fulton Sheen, which begins with these famous words:

There are not over a hundred people in the United States who hate the Catholic Church. There are millions, however, who hate what they wrongly believe to be the Catholic Church — which is, of course, quite a different thing. …

And lest you think a preconciliar resource from the middle of the twentieth century has no bearing on the challenges of the twenty-first, here is +Sheen a few paragraphs later:

If I were not a Catholic, and were looking for the true Church in the world today, I would look for the one Church which did not get along well with the world; in other words, I would look for the Church which the world hated. My reason for doing this would be, that if Christ is in any one of the churches of the world today, He must still be hated as He was when He was on earth in the flesh. If you would find Christ today, then find the Church that does not get along with the world. Look for the Church that is hated by the world as Christ was hated by the world. Look for the Church that is accused of being behind the times, as our Lord was accused of being ignorant and never having learned.