phpMyAdmin is just the a userfriendly backend for a database like MySQL-database. What you now need is a PHP Script that runs and SQL statement similar to "SELECT Price, Link From ". You can then call the PHP script from the WWW class, then you can use the returned informations (WWW.text) to display them in a map.
I've recently worked on a tutorial series about creating a secure scoreboard system with a mysql database to insert and querry data from the database, I think this one might also be useful for your case.
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