I have the primary from an Orion Premium Deep Space Explorer telescope - 16" F4.5. These were made by Discovery telescopes. The mirror is Pyrex and has 94% enhanced coatings. I also have the 2" focuser, spider and diagonal mirror from the scope and altitude bearings (large with handles). I carefully cleaned the primary a few months ago and the mirror was in excellent condition.
$850 shipped or pick up (you can have the tube if you pick up) $800.