I bought a treadmill at the beginning of the year that holds 325 pounds. Other than buying a used one from craigslist or ebay or similar you will probably not be able to find a treadmill that holds that weight for under $700-$800. I paid like $750 or something close for mine on walmart.com. Off the top of my head I can't remember what brand it is. The higher weight limit treadmills will cost more than one that holds less. I had to get one at that weight so my hubby could eventually walk on it. At the time he was 440 pounds. He's now down to 365 so he's getting there.
~ One day at a time. Every pound lost is a pound that will never return. ~