Ok, I have everything you need except some plywood, a few aluminum poles and the time to put it all together. Nobody committed at $600 plus shipping, so I will try $550 shipped and see what happens. I need the dough. 8^)
good condition 13.1" f/4.5 mirror out of a coulter dob
brand new 2.6" diagonal Mirror (Rated 1/10th wave)
brand new Diagonal holder and 4-vane spider (14" from nut end to nut end)
and an all metal 2" focuser with 1.25" adapter, focus lock screw, and 3.2" of precision travel
I took pictures with the sun nearly overhead (ask me about my instant sun burn) and so every dust and smudge should be visible. It is a good mirror with only light surface scratches, a couple fingerprints on the edges, and some dust. Nothing you will notice in the dark when you are awed by the deep sky wonders available to a mirror this size.
I am asking $550 and I will pay shipping and insurance in the Contiguos US. I prefer paypal but will also take postal money orders.