Ok, I have everything you need except some plywood, a few aluminum poles and the time to put it all together.
good condition 13.1" mirror out of a coulter dob
brand new 2.6" diagonal Mirror
brand new Diagonal holder and 4-vane spider
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 around 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 $600 Plus actual shipping and insurance. I prefer paypal but will also take postal money orders.