https://www.tvtechnology.com/equipment/sonnet-now-shipping-avidcompatible-thunderbolt-expansion-chassis
Sonnet Now Shipping Avid-Compatible Thunderbolt Expansion Chassis | TV Tech
Jan 22, 2013 - Sonnet Technologies announced that the Echo Express Pro Thunderbolt Expansion Chassis for PCIe Cards now supports Avid Pro Tools|HDX PCIe cards
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https://www.dlpaudiodesigns.com/shop/Computers/Computer-Components/Computer-Cases/p/Sonnet-Echo-Express-SE-IIIe-Thunderbolt-3-Three-Slot-PCIe-Card-Expansion-System-x57568342.htm
Sonnet Echo Express SE IIIe Thunderbolt 3 Three-Slot PCIe Card Expansion System - 732311012938
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https://shopperplus.co.uk/product/asus-thunderboltex-5-expansion-card-pcie-4-0-2x-thunderbolt-5-usb-c-3x-mini-displayport-in-up-to-120gbps-bandwidth/
Asus ThunderboltEX 5 Expansion Card, PCIe 4.0, 2x Thunderbolt 5 (USB-C), 3x Mini DisplayPort In, Up...
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