much cheaper than that...
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https://www.aliexpress.com/item/Pair-of-Replacement-Ear-Pads-Cushions-with-Head-Beam-Cushion-for-Sennheiser-HD8-DJ-Headphone-Black/32725742169.html?scm=1007.13339.33317.0&pvid=a98ad101-4983-4dc5-94c9-dca15b163c23&tpp=1