Find the level name of the catalog with the lowest price (in USD).
SELECT t2.catalog_level_name FROM catalog_contents AS t1 JOIN catalog_structure AS t2 ON t1.catalog_level_number  =  t2.catalog_level_number ORDER BY t1.price_in_dollars LIMIT 1
SELECT t2.catalog_level_name FROM catalog_contents AS t1 JOIN catalog_structure AS t2 ON t1.catalog_level_number  =  t2.catalog_level_number ORDER BY t1.price_in_dollars LIMIT 1
[{'catalog_level_name': 'Category'}]