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
eTap AXS BlipBox | ES-EAC-BBOX-D1 | SRAM
SRAM eTap AXS Blip Box fldf.ma
SRAM ROAD: eTap AXS™ BlipBox™ System Installation - YouTube
Duncan Shea-Simonds on Twitter: "Super slimline 3D Printed SRAM Blip Box lower moulding. Deleted Garmin style mounting boss and battery hatch. Re-use internals and upper moulding. Much easier to conceal behind fairings