I have up for sale a set of glow plugs. They are all actual Bosch Duraterms which are the best glow plugs you can get for these engines. The set is a used set that has been tested. All four glow quickly and brightly. $15 shipped (in the lower 48) for the set of 4.

EDIT: New sets are all sold. Used set still available.
One new set sold. One new set of 4 still available for $30 shipped in the lower 48. The used set is available for $15 shipped in the lower 48.
Hey sell me some new ones.
Giving up on the IDIs?
I haven't totally given up on the IDI's but am breaking bulk on some back stock.