There is a new option for the retail MagicBands sold at the Walt Disney World Resort.
It's called 'Link-It-Later' and this option gives guests the option to purchase a retail MagicBand and link it to a valid theme park admission at a later date.
Before the launch of Link-It-Later, guests who purchased a retail MagicBand had to link it at the time of purchase with a valid theme park admission, Memory Maker card, or another active MagicBand.