Authentication is a possible solution.
Take a look at this as a possible solution to offering confidential prices. The URL need not be published, just announced through conventional means or Email to your wholesale customers. This is a fake email address. So many old members of this list were getting spam generated from siphons trolling the archives that I replaced all email addresses with randomly generated spam traps that forward mail to spam fighters. If you need to reach individuals mentioned in these archives, use a search engine to find their current location, as these addresses and archives date from 1994 to 1996.