Animal Crossing Bells Services or from the application

Nook Shopping either at the Nook Stop in Residential Animal Crossing Bells Services or from the application on your telephone. 

Keep in mind - you'll need to accept that these things will show up and you can just request five things from Nook Shopping at a time, so make sure you plan your buys prudently. 

Whenever Buy Animal Crossing Bells you've gotten your lines, place the two of them in various regions across your island.