price
$meta_query = array( 'relation' => 'AND', array( 'key' => 'price', 'value' => '100', 'compare' => '<=', ), array( 'key' => 'price', 'value' => '500', 'compare' => '>', ), );
$meta_query = array( 'relation' => 'AND', array( 'key' => 'price', 'value' => '100', 'compare' => '<=', ), array( 'key' => 'price', 'value' => '500', 'compare' => '>', ), );