"Day, who projects that his company will hit $3 million in sales this year, expects the Internet component of the business to overtake
face-to-face sales soon.

'We anticipate in the next couple years that those numbers will reverse 70 percent online and 30 percent traditional retail,' he said."
Chuck Melvin, "More Retailers Embracing the Net,"
The Plain Dealer, October 17, 1999
Corporate sales types have used the phrase "face-to-face sales" since at least the early 80s to refer to a sales pitch made in person, as opposed to a telephone pitch or a "drive-by" (a pitch that consists of nothing more than dropping off product literature):

"Amekor Industries beats the increasing cost of face-to-face sales calls by relying on the telephone approach."
Carol Rose Carey, "Technoqies for Ringing Up Orders," Inc., November, 1982
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Using the phrase to refer to retail sales in a physical store became popular in the late 80s and early 90s when mail-order shopping was in vogue:

"For much of the 1980's, mail-order sales grew by about 15 percent a year. That was triple the growth rate of most department stores and other retailers that depend on face-to-face sales."
Eben Shapiro, "The War of the Christmas Catalogues," The New York Times, November 15, 1991
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But the phrase has really picked up steam over the past couple of years as online retail has become a popular alternative to fighting the hordes down at the mall.