I just bough a used Proform XP130 for $200. I thought this was a good deal sicne its $500 new. The couple I bought it from said they barely used it. The problem is that it makes a really loud creaking sound when you get it up to about 55 rpm's. When I tried it at the sellers house, I guess I didn't push it hard enough because it was pretty quiet when I tested it out. It seems to make a creaking sound when the rpms get high and from the machine swaying back and forth as you go harder on it. Should I just deal with it since its a cheap home machine and wear an ipod to drown out the noise or should I resell it? Is it possible to get a home machine for $300 or less that wont make a lot of noise? Should I try a rubber mat underneath it? Right now its on the tile floor in our basement. It's weird because its very quiet until you get the rpm's up. The noise is coming from the front of the machine from the supports rocking back and forth.