I have a Horizon Fitness CST3 treadmill. I've had it for over a decade, but haven't used it in a few years. It has just been in storage after a move and I no longer have a need for it. I bought it new at Dick's sporting goods and it was considered a commercial grade treadmill. When I used it I had no problem running on it. It also folds up for easy storage.
2hp motor
Up to 10 mph speed
Up to 10% incline
3 speed fan
You can see some damage to the side plastic that occured during a move. It does not affect the treadmill's working ability. It has a few dings and scratches like this, but it is very solid and has always worked great. I replaced the control panel a few years back as well. If you are looking for a affordable treadmill to keep at your house to get some exercise, this is a good one. Asking $100.