Amazon.com: Suspension Seat Post, Shock Absorber Post, Aluminum Mountain Bike Seat Post with Protective Cover, for Most Mountain and City Bikes, 27.2 28.6 30 30.4 30.8 30.9 31.6 33.9 X 350mm : Sports & Outdoors
Cirrus Cycles Kinekt 2.1 Suspension Seatpost - 30.9, 420mm | Tree Fort Bikes
Zoom Suspension Seatpost 30.9mm x 350mm Black – CycleZoo
Cane Creek Thudbuster LT Suspension Seatpost - 30.9 x 420mm 90mm Black – Spirited Cyclist
GEWAGE Suspension Seatpost for Bicycles - 27.2/30.9/31.6 X 400mm Shock Absorbing Bike Seatposts - Lightweight Aluminum Alloy Seat Post for MTB Road Bike BMX eBike - Walmart.com
GANOPPER Suspension Seatpost 25.4 27.2 28.6 30.4 30.9 31.6 40mm Travel Damping Seat Post Alloy Seat Tube Bike Part 30.4*350mm
MTB Bike Suspension Seatpost 27.2/30.9/31.6mm Bicycle Seat Post Travel 50mm mountain bike Seat Tube Suspension shock absorption - AliExpress
Cane Creek Thudbuster ST G4 Suspension Seatpost - 30.9 x 375mm, 50mm, – Bicycle Warehouse
Amazon.com : BICYCGEAR Suspension Seatpost 27.2 30.4 30.9 31.6 Bike Seat Posts with Suspension 40mm Travel Bicycle Seat Shock Absorber Aluminum Tube for E Bike MTB BMX Road City Bike Replacement Component