I've just hand regged 10 4L .co domains at $6.59 each. They were available at other places too for regular price. I initially thought this can't be real since I've heard in the past that all 4L .co domains are considered as premium ($120+ to reg for the 1st year) by the registry. 9 of them were either AXAY type or XAYA type. And the other one was a ABAB type. None of them were pronounceable though.