Although you might think that all kiosks offer things that can be purchased, in the blog Hazme el chingado favor [es], La Banda writes about a peculiar kiosk [es] in Mexico City, where the owner:

makes it very clear that although magazines are for sale they are really not, so don't peek in to look for him because he is not there […] but just in case, he leaves a phone there so that you can call and make an appointment so that you can finally purchase the month's magazine.