AV home theatre or Audio Stereo System

Hi, i am new in this forum and in Cairo.
Although i am still living in Hotel i hope to find a flat asap. Meanwhile i start looking for a AV system.
Please, let me know any info in a good place to look for good equipment (or second hand worthy to buy)
In case i would like to import it how much the custom duties will impact in percentage on invoice?
Thank you all for any advise.
Kind regards

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