The slate for my 4.5 x 9 Pro was 250 for each of the 3 pcs and 30 mm. One piece is probably in the same neighborhood. You may want to consider a dolly to move the slate and save a back or an injury.
I think you're going to have to come down a bit more man. I mean Diamond is selling used Blue Label Pro-Am tables for that same price. The new Blue Label rail system is $1500 from Diamond to replace the Red Label. I wish you luck though man! Hell I'd buy it if you were closer to me and came down in price more myself.