Side tables for small spaces are available at Crate & Barrel and West Elm. Some good options for small side tables are stool-like tables, nesting tables or C-shaped tables.
Crate & Barrel sells a wide variety of side tables for small spaces. As of 2015, this includes their C table collection and several types of nesting tables. C tables are narrow tables that fit nicely beside a sofa. They are approximately 10 inches wide and 20 inches high and are priced from about $150 to $300, as of 2015. Crate & Barrel also sells several nesting table sets. These are groups of two to three tables where the smaller tables fit beneath the larger tables. They are priced from about $200 to $500.
West Elm sells many small round side tables similar to garden stools. As of 2015, there are several varieties available in woods, whites and metallic colors. All are about 12 to 15 inches in diameter, making them easy to fit into a small space and move around if needed. They are priced at about $150.