This sensor retrieves the number of available units in stock of a product at the specified IKEA store. Use it to trigger a notification when a product is back in stock or similar.

Copy the ikea.py script to your custom components directory: <HASS_DIR>/custom_components/sensor.

Add an IKEA availability sensor using the sensor platform:

sensor:
  - platform: ikea
    product_id: 40364748
    store: '012'
    url_locale: se/sv
    friendly_name: Trådfri wireless control outlet

product_id
   (string) (Required) The id of the product you want to monitor. You will find the product id
   in the URL of the product page on ikea.com, example: https://www.ikea.com/se/sv/catalog/products/<product_id>

store
   (string) (Required) The id of the store to check availability in. Some countries are available here, but if your country is
   missing, retrieve your store id from the HTML of the availability drop down list on the product page at IKEA.
   Note: use single quotes around the store_id to make sure it gets interpreted as a string and not a number.

url_locale
   (string) (Required) The locale to use in the URL when querying IKEA. Check your country specific IKEA website URL
   Examples: sv/se - Sweden. fi/fi - Finland, and so on.

friendly_name
   (string) (Optional) Give the sensor a friendly name, otherwise it will be named ikea_<product_id>

The sensor will update its value every 5 minutes. However, it's unclear how often IKEA updates the values reported through their API.