Amazon also sells these two AIO coolers for the Enermax Liqtech TR4 series of AIO liquid coolers for the AMD Ryzen Threadripper (works also on AMD EPYC systems since both use physically identical sockets)
PCPartPicker page (240)
PCPartPicker page (360)
Amazon retailer (240)
Amazon retailer (360)
Updated, pricing should show shortly.
Pricing for the 360 model didn't update. Only the 240 model did.