It's automatic system against undercutters has kicked in. It monitors models with unreasonably low prices and doesn't let to lower price even lower. Instead of setting price lower, try to increase it - maybe that will work ;]
P.S. on a more serious note, wait for a day or two and see if price will updates - sometimes changes are slow to update here on CGT.
P.P.S. but really, what do you expect to earn from such pricing? How many times do you expect to sell this item and how much earning it will bring in the end?