Now housed in a less-than-pleasant building near the bus station on Luong Dinh Cua Street, the Sapa market is probably the most convenient place to purchase tribe crafts, textiles, and other local specialties. Once the gathering place of sellers and craftsmen and women from the tribes surrounding the area, due to mass tourism and effective management, the market is now populated more by sellers coming from outside the province. High rents and operational costs have pushed not a small number of local tribe people out of the market. It's not uncommon to find cheap, mass-produced knockoffs of tribal crafts mixed in with the real deal.
Even so, browsing the wares while watching the sights of H'Mong and Red Dao women in their richly embroidered dresses and elaborate silver jewelry is still a hard-to-beat experience. The quality and price of the market product offering have become a buyer-beware affair, but the market is still the most populous and convenient place to pick up something for the memory.
Part of the fun is bargaining, but don't express too much interest upfront. Hold out for as long as you can, and then ask to see the good stuff. You'll likely be shown fabric of quality superior to what was offered only moments before.
The market is at its peak on Saturday when tourists from Hanoi flood into Sapa; you may actually find it quieter and more fun on weekdays.