Sort posts by meta key that is serialised with other meta keys

You will find it prohibitively difficult to query on PHP serialized data, as it is essentially nonsense as far as MySQL is concerned. You should store price separately under its own key if you want to query on that data.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)