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The archaeological museum is a part of the Slavonian museum (Muzej Slavonije). It's very interesting to watch at all the exposed materials from times before Christ to nowadays.This is the cheapest museum in which I ever was at. The standard entrance fee is 10 kunas (about 1.5 €), but for students it's only 5 kunas (about 0,7 €). It's located in the old part of Osijek, known as 'Tvrđa', on the main square, and across it is the other museum, the Slavonian museum.I suggest you to visit both museums, it's worth the experience.