If you need other combinations, you can check the inventory website:

Level 20+:
http://118.89.84.40/item?id=279&user_id=10227

Level 8 {slightly more expensive}:
http://118.89.84.40/item?id=279&user_id=10291

Choose the combination you like, copy the combination code and send it to customer service to inquire about the price.