Step 3: Alternatively, you can access this Rocket League Credits menu via the Nook Shopping app on your NookPhone.

Step 4: Tab over to the Promotion section.

All Super Mario items in Animal Crossing: New Horizons and how much they cost.
Here's a full list of every Super Mario item that's been added to Animal Crossing: New Horizons, and their price in Bells. There RL Items are a total of 33 items to buy, meaning it will take you about a week to get them all if you buy the maximum amount daily and don't utilize time travel.