I have had some luck finding cockpit tables at boat jumbles. Got the Lewmar one (ABS) (Whitlock as then was) for £20, 25 years ago which is still doing its stuff on my old boat and for the current boat got a larger all grp one of the same design for £50 - the mounting was intended for central fixed pole but I adapted it to swing up supported on self supporting sprung s/s folding brackets (£16 on ebay) - but greater length means higher off the sole - accommodated by using thicker cockpit cushions!