Giantex
Giantex Standing up Desk, Height Adjustable Stand Up Desk Riser w/ Large Platform & Tablet Holder, Gas Spring Ergonomic Sit Stand Desk Converter for Keyboard, Monitor or Laptop (Black)
CubeFit
TerraMat Standing Desk Mat - Ergonomic Anti Fatigue Mat for Stand Up Desk and Standing Workstation - Topography Comfort Standing Fidget Mats for Standing Desks by CubeFit
Generic
Generic Space Heater Under Desk Electric Foot Warmer 170W Personal Electric Heater Under Desk fit Leg and Feet Tip-Over 45°Angle Auto-Off and Overheat Protection for Home Office Desk Bedroom, EFW51031
Mount-it!
Mount-It! Anti Fatigue Floor Mat | Standing Comfort Mat for Standing Desk, Home, Office, Kitchen, Garage | Anti-Slip Washable Surface| 18"x22" | Rubberized Gel Foam