赞！ FYI: I found this

""every man has his price" is apparently a mis-quote of a remark by Robert Walpole, made in 1734, that "I know the price of every man in this house (i.e. the House of Commons) except three", although it is believed that the phrase was in common use before this time."

from: https://literature.stackexchange.com/questions/2622/looking-for-a-quote-it-may-be-true-that-every-man-has-his-price-but-there-is-n