meta_query
$meta_query = array( 'relation' => 'AND', array( 'key' => 'wpcasama_max_price', 'value' => '$price', 'compare' => '<=', 'type' => 'NUMERIC', ), array( 'key' => 'wpcasama_min_price', 'value' => '$price', 'compare' => '>=', 'type' => 'NUMERIC', ), );