If you are looking for educational materials for kids or specific textbooks, these niche stores are recommended: Buying Russian language books - LingQ Forum
Buying Russian books in the United States is primarily handled by dedicated online retailers based in and San Francisco , as well as international stores with reliable global shipping. Top Specialized Online Bookstores in the US
: One of the oldest and most popular online Russian bookstores in America. They are based in New York, stock over 150,000 titles, and offer worldwide shipping.