There are tons of monthly “box” services that are springing up across all kinds of verticals. You can easily build your own premium (or non-premium) box service and have a great business with recurring revenue. Every month, you would send out of unique box will hand-selected pieces that apply to your industry.
You could also do box services involving gourmet foods, wines, cosmetics, toys and many more. This is a great way to build a continuity program while also having a recurring base of members that you can upsell other one-time offers and other ancillary products or services.