Sometimes is takes a while, but prices do rebound eventually.
That being said, be aware of yo-yoing. I have seen it a bunch on the Harbinger: prices are low one day, rebound to "normal" the next and then are depressed again (mostly because the same individuals are posting at ridiculously low prices and posting too many to buy up and re-post).
I see this all the time with augments. The going rate will be 95k+ and somebody will post two dozen for 82k each.