need treadmill that will... WORK...

Ok... so I'm close to 300 pounds... and I need a treadmill that is safe to use for people who are over 250 (since that seems to be a common weight limit on exercise equipment, which is totally retarded but whatever).. i have a soloflex with all the attachments that i tried to trade to play it again sports so that i could get myself a treadmill... but they won't take it because they don't deal with soloflex so... my question is... does anyone know where i can get a nice treadmill that is not too terribly expensive??? i've had to cancel my gym membership since it was costing me too much every month so i can't really afford to spend a lot on a treadmill, either... but since i don't have insurance to get the surgery, i need to figure something out can anyone help me??? brandi