Query postmeta values, and return multiple post_titles for common meta value

As of now I query the DB:

global $wpdb;

        $query = $wpdb->prepare('
            SELECT p.post_id, p.meta_value, pm.post_title
            FROM %1$s AS p
            JOIN %2$s AS pm ON (p.post_id = pm.ID)
            WHERE p.meta_key = "Price"',

            $wpdb->postmeta,
            $wpdb->posts
        );
        $results = $wpdb->get_results($query);

This returns an array of objects containing the metavalue, post_id, and post_title. Using these I create my dropdown of "prices"

<select name="s">
    <?php

    foreach ($results as $result) {

        echo "<option value=\"$result->post_title\">$result->meta_value</option>";
    }
    ?>
</select>

However, as of now this generates a selection for each value with no regard to weather it is a duplicate or not. For instance if price is "10" on two separate posts, I will have 10 twice in my dropdown. How can I alter this so that there is only 1 "10" and it returns all the posts with metavalue of 10?