https://nokiapoweruser.com/lumia-521-still-the-no-1-best-seller-at-amazon-and-hsn-no-3-at-walmart-q3-may-see-lumia-volume-surge-in-us/
Lumia 521 still the no.1 best-seller at Amazon and HSN. No.3 at Walmart!! Q3 may see Lumia volume surge in US.