Thank you for your message.
The product price is most likely a custom field/meta on the post of the product.
You can display custom field values in newsletters using [newsletters_meta key=X]
. See this: http://tribulant.com/docs/wordpress-mailing-list-plugin/10552
If you’re using [newsletters_posts...]
shortcode to display posts of products, you can go to Newsletters > Configuration > System Emails > Posts and edit the email template there and put your [newsletters_meta...]
shortcode in it. Same goes for Latest Posts Subscriptions… you just need to edit the “Latest Posts” email template there.