If you got some key of the underground, bathory is fabulous place to train. Witched Starsand beats hillwind or sharp leaf in zeny worth (by selling to players and I'm very sure they will ALWAYS sell out), and their card is one of the best pvm card. Not overly difficult to dodge, low attack power, and you can mob them too if you are built for that. Auto counter against Joker and fly wing from the swords/jokers.
My own knight trained down there all the way until lv 97.
There's also Byalan 4 with Marcs and Swordfish, and if you have healing items or feeling gutsy, could try floor 5 for Strouf and Merman and the occaisional Deviace (Just watch out for that cursed Eralia if you do go down there, and water/wind armor/wings are recomended for when strouf/swordfish hit you with magic)
they give much better zeny.
If you have hydra carded weapons, you could try going Rachel sanctuary, but be careful, you're still pretty low level for this place, but it is Possible to work here. And you'd need to do a quest to gain access.