There is nothing wrong with someone posting a link to a legitimate product, service, or source of information in a RadioReference forum post.
If someone purchases a product or service, there's nothing wrong with them posting the price they paid.
If Whistler wishes to have an active presence in the RadioReference forums to provide customer support, they are welcome to participate.
If Whistler wishes to post prices of their products or services or discuss items for sale on a regular basis, they can talk to
@blantonl about establishing a commercial relationship.