Kellyco is advertising one used 70 with standard coil, 5 X 10 18.75khz DD and 9'' 3 hz for $695.00. They they it has some minor scratches. I don't know if it includes a warranty. It might be worth checking out if you looking to save a few $$$. That would be about a $250. savings over a new one with the same coils, but I don't think I would pick it up unless the 4 year warranty was included.
Good hunting, John K
Good hunting, John K