select list in webform containing the list of node titles
Check out https://groups.drupal.org/node/71588 for providing dynamic select options to the webform module. You'll have to specify the content type, but here's a query that can be used to populate it (replace product with the machine name of the content type):

SELECT nid, title FROM {node} WHERE type = 'product' AND status = 1 ORDER BY title ASC