I've used a $900 (store marked down price) VISION FITNESS treadmill for the past, oh about 6 years and never had a problem with it. It gets used at least 30 minutes once a week, sometimes more.
I've never re-greased the tread... Put this on my list of things to do really soon.
It doesn't look like they make the cheaper ones like I bought any more, but here's their current cheapest one with deluxe display for $1,700.00. http://home.visionfitness.com/treadmills/t9200/deluxe/
No wonder I had such a hard time carrying this thing around, it weights 225 lbs. I had help and we used a 2 wheeler and it was still difficult. One mistake we made I wouldn't make again, is to make sure the heavy end (with motor) is at the bottom of the 2 wheeler, not at the top. (Unit in shipping carton)