Amazon.com : COCH Zoom Bike Seat Posts Bike Suspension Seatpost 27.2mm 31.6mm Alumium Adjustable Seatpost for MTB Road Bike Mountain Bike Fixed Bike Seatpost (Silver, 27.2mm) : Sports & Outdoors
Review: Redshift ShockStop may just change your mind about suspension seatposts - Bikerumor
ZOOM Bike Seatpost Spring Suspension Damping Seatpost 27.2/30.9/31.6mm MTB Road Bike Bicycle Aluminum Alloy Seat Post Seat Tube
ShockStop PRO Suspension Seatpost V2 – Redshift Sports
Amazon.com : AARON - Spring Suspension seatpost - Aluminum Bike seat Post for E-Bike, MTB, - 1.1", 27.2 - 30,9 - 31,6 mm Diameter, 13.8" (350mm) Length : Sports & Outdoors
EveryMarket
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
Suspension Seatposts, The Complete List (tested) - BIKEPACKING.com