Amazon with BASEUS US Tech has the Baseus Aluminum Alloy 6-in-1 USB-C Hub Docking Station Dongle for iPad Pro 2018 / 2020 for $50 - 20% off coupon (check green "Save coupon" box) -  $20 off with code BASEUS400 [Exp 10/23] = $20 with free shipping on $25+ or with Prime.

Features USB-C PD port, 4K HDMI port, 3.5mm audio port, micro SD slot and 2 x USB 3.0 ports. It is compatible with some cases (YMMV and *not* the Magic Keyboard case).