Horror Toy Factory is very easy and rewards MCA + OCA.
Bakonawa once a week and hope for the Spirit Piece to make a Bako Tattoo.
You can run Hazy Maze for a chance an OCA - not too reliable, but fast and can be run often.
If you feel like trying your luck you can run GMT (Fenrir Card) or the first floors of ET (GTB, Mistress).
Ghost Palace is very easy - in case you really need all the zeny you can get for a lack of chars you can farm other stuff with.
OGH is doable but the second floor is very meh on WL. D:
There are videos of those instances with WL in the video thread, on Sewasan's youtube channel and on my youtube channel.(I need to record again gdi. :u)