I don't know about anyone else, but I made a boatload of credits selling low-level (17 through 39) item modifications (armorings, mods, and enhancements). Everything was selling within 2-4 hours, and for $2k-$5k more than normal. I was spending so much time sending companions on gathering and crafting missions, that I didn't actually get to level my Vanguard as much as I would have liked.
Needless to say, I'm stocking up and getting my premades done before this Friday starts.
The only things that I saw that were getting severely undercut were purple lvl 49 augments. But that just seemed to open up the lvl 47 augment market, where I was selling those for more than what the lvl 49 ones were going.