I have 3 Porter Cable belt sanders for sale. They are A3/504 arguably  the best sanders ever made. Google them and decide for yourself. The problem is that parts are very hard to find. I buy any I can and steel parts back and forth .I lhave decided I am all set for myself if I keep 2 and my Supply of parts. The 3 I have for sale are working fine and as long as you keep up with the oil they will last a lifetime. One that I have was made in the 50s and is still going strong. I am asking between $200 and $300