I am selling my MX-500. This unit is only 6 months old and in perfect condition. I had the MX-700 with a prepro I was using and sold the prepro so I bought this one. If you can live without a computer interface this one is 99% of what the MX-700 is. My price is $80 fixed including shipping and Payapl fees. I have OBM and and will include brand new batteries. PM me or email me at [email protected]. Thanks.