Is it (religiously) moral and legal to sell a Bible to a second-hand bookshop?

I am not a Christian. In a second-hand bookshop I often visit, there are many Bibles for sale. These books are mostly in Chinese and Korean, sometimes English, piling up meters high (maybe 200 prints or more). The bookshop owner says many Chinese and Korean believers sold (or sometimes donated) them to him, and he re-sells them at ￥50-100 each. I am curious, from a religious view, is it legal to sell the Bible to an apparent non-believer bookshop? As far as I know, Bibles are given **freely** to believers in where I live (in China). Does it make any difference, whether the Bible is acquired free, and whether it is sold or donated (either way the bookshop owner will finally sell them at a price, he will not donate anything for sure)? I believe it will be not very moral if I take one for free and sell it to a bookshop for money. P.S. In contrast, the Buddhist temple of my city also gives out propaganda books/leaflets for free. It usually prints "to achieve maximum merits, please don't discard; if you no longer need it, give it to another believer", indicating selling is not approved. And I seldom see free Buddhist books sold in that bookshop. Also, some Islam sites say selling Arabic or donated Quran to non-muslims is prohibited too. From the below answer, it seems Christianity really has a different tolerant view on this issue.