No. We found that users prefer specific retailers and considered competing offers as SPAM! You are welcome to add the item from more than one retailer... we will even group the items so your interface is less cluttered.
Edit 12/22/2021: There is a case where you may receive an email notification if other users are watching the same item and we are in an affiliate relationship with the alternate retailer and the alternate retailer has the item in-stock at or below your notification price.