If you plan to visit more than two museums it is well worth to buy a day or even a year pass for all museums of the city. Those passes exclude only the museum Historisches Grünes Gewölbe and special exhibitions.
A daypass (Tageskarte) costs 12 Euro, a family ticket 25 Euro.
An annual pass costs 20 Euro.
If you consider that the admission for the museum Alte Meister already costs 12 Euro, and the Porzellansammlung 6 Euro, you can see how fast it is worth to have the annual pass.

