Cylinder head gasket

Help!!! Is it really very expensive to change the cylinder head gasket? My oil is enormous from the area and the males from the workshop thought it must be new! What does that cost??? Must really consider whether I buy it or if I get it from the other. Because, if so much has to be repaired, the 1000 €uro Kuafpreis are also a bad consolation. Info: Mercedes Benz w201 (190e) 2.0 l 118 PS Bj. 87 Well and I have the following problems: Shock absorber front right oils up by d he screw, the car hangs very exceptionally deep at the back. With cylinder head gasket it oils violently. Jumps badly and hobbles at low speeds. Tray joints at the front right have already been changed! What do you mean? Keep the thing or sell it again? I really have no idea if the whole repertures are still worth it. Heavy decision! But where should I find another 190 in white so quickly, with 2.0 l in my vicinity????? Is not so easy! And especially so good nstig! Or was that an expensive car????? PLEASE HELFT ME MIR MAL!!!!!