Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE products (product_price VARCHAR, product_id VARCHAR); CREATE TABLE complaints (product_price VARCHAR, product_id VARCHAR)
### Question:
Find the prices of products which has never received a single complaint.
### Answer:
SELECT product_price FROM products WHERE NOT product_id IN (SELECT product_id FROM complaints)