The AMD Radeon RX 6800 XT and Radeon RX 6800 are now released. The RX 6900 XT will be released on December 8, 2020. AMD announced a MSRP of $579.99 and $649.99 for the RX 6800 and RX 6800 XT respectively.
No surprise that NewEgg had nothing for sale at all suggests that inventory was very limited much like what happened with recent NVIDIA cards.
Most likely more video cards will be available into 2021. Manufacturing is slow at present due to supply chain problems. With NVIDIA using Samsung, AMD can book more production into 2021 to handle the demand for graphics cards and processors.