We know of 2 315 places to buy second-hand in
276 of the country's municipalities, and
9 upcoming flea markets with dates confirmed against the organiser's own announcement.
Flea markets in Norway follow the school year: March to May in spring, September to October in autumn. They are run as volunteer work by marching bands, sports clubs and associations, and are often announced only on the organiser's own page, two or three weeks ahead. That is why they are hard to find — and why this overview exists.