I believe a mini-bar/fridge is only in categories PH, S, SS, A & B. However, you can find check this out by going to icruise.com, select your Oosterdam cruise date, then your room category and it will show a complete description of your cabin and price for that sailing. Have a great trip!
I advised HAL I needed a refrigerator in my cabin to store medication (Outside cabin, Oosterdam 9/26 out of Vancouver). They advised that I could store it free in the infirmary or could have a refrigerator in my cabin for $2 per day charged to my onboard account.