50% of new is retail used prices.
Hopefully a buyer with cash can do better,
but if in demand, it may be the best you can do.
It's a bargaining starting point anyway for a buyer or seller depending on
how much in demand the part is assuming it is in perfect condition.
You can do good sometimes buying used, but the costs in time, shipping, and
communications, while waiting on an unkown part is not worth the little you save often.
But if they don't make a quality part any more that is available in new condition too, that
would be a bargain for 50%! You had beter buy it before someone else does up to about
75% of new depending. Wasting time looking for something used adds up quickly, and it's
not over until you inspect the item after you receive it (which can seem like forever!)