The dolby plaque is available for $20 from the dolby store and the DTS plaque is available for $35 from the dts online store. The THX plaque is no longer available to anyone without a THX profesionally certified and calibrated theater. Some HT online stores used to sell them but THX made them stop. I have seen an original THX plaque go for over $400 on ebay, makes me wish I had bought a few extra when they were available!
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