Here are a variety of treadmill models that sell for under $400.
15% Auto Incline Treadmill for Home, Double Deck Treadmills with Incline,3.5HP Treadmills with Incline, Support Handrail/Console/App Control, Portable Treadmill Running Machine for Small Spaces Price: $329.99
MERACH W50 Walking Pad Treadmills for Home, 12% Auto Incline, 400lbs Capacity, 3.5HP Supper Quiet Brushless, 16.5"x41.3" Spacious Running Belt, Under Desk Treadmill with Remote & LED Price: $329.99
YUEJIQI Treadmill with 0-15% Auto Incline, 3.5HP Quiet Brushless Foldable Treadmills for Home, Small Space Portable Running Walking Machine, 300 Lbs Capacity with Bluetooth APP & Pulse Monitor Price: $329.99
Walking Pad Treadmill with 12% Incline and Handle Bar, 4 in 1 Folding Treadmill for Home/Office, Under Desk Treadmills Portable Walking Pad with App & Bluetooth Speaker, 0.6-10MPH Price: $349.98
PACEROCKER Walking Pad Treadmill with 12% 9-Level Auto Incline, 450 lbs Capacity Bluetooth Speaker Under Desk Treadmills for Home Hiking, 5 MPH, Black Price: $315.00
Walking Pad Treadmill with 18% Auto Incline, Foldable Under Desk Treadmill 300lbs Capacity with Remote Control, 3.5 HP Walking Pad with Handle Bar & LED Display for Home Office Use Price: $309.99
Ternewby Treadmills for Seniors, Treadmills for Home with Handrails, Dual Shock Absorption, 300 LBS Capacity, Heart Rate Monitor, Bluetooth App Control, Ideal Treadmill for Elderly & Family Use Price: $359.99
PACEROCKER Walking Pad Treadmill with 12% 9-Level Auto Incline, 450 lbs Capacity Bluetooth Speaker Under Desk Treadmills for Home Hiking, 5 MPH, Blue Price: $356.21
UREVO Smart Treadmill with Height Adjustable Desk Workstation, Compact Foldable Treadmill for Home Office, 9% Auto Incline with Follow Mode, 6 HIIT Programs, SmartCoach App, Water Bottle Holder Price: $379.98
THERUN Incline Treadmill, 0-12% Auto Incline Treadmill for Running and Walking, 300 lbs Weight Capacity, Wide Belt,3.0HP,18" LED Screen, 2 Layers Shock-Absorbing Red Price: $399.99