Tiny SRAM Wireless Blips give you eTap AXS shifting anywhere you want - Bikerumor
Mountain Bike Action Bike Hacks: A Better Dropper Seatpost - Mountain Bike Action Magazine
SRAM eTap Blip Clamp 31.8mm Pair — Playtri
Bent Up Cycles - SRAM etap blip box. Technically, you only need this and don't need the blips. But I have found that shifting with the blips by the brake levers works
Tiny SRAM Wireless Blips give you eTap AXS shifting anywhere you want - Bikerumor