As @kazu said, laundry price is higher in Europe and other cruises outside No America, so that could be impacting the price you're seeing. That is for both the per bag and unlimited options. The per bag price for your ship is only visible once onboard.
I've used the per bag a lot and it's still helpful in reducing the amount as pack. If you roll then stack clothes before putting into the bag, you can fit a lot in one bag, so even if it's $35, it can be a deal.