Need a monthly delivery of doomsday prepping supplies? How about treats for your pet rabbit, or only-available-in-Japan snacks like Umashi Oasi Cheetos?

Then you might be a candidate for the latest consumer craze: the subscription box. A growing community of eager shoppers seeking both the convenience and surprise that every regular delivery brings are flocking to the concept, paving the way for ever-more-eclectic and specialized offerings. Generally priced at $10 to $30 a shipment, the boxes are stuffed with goodies built around a theme, but usually filled with a surprise mix of products picked out by a curator.

“I get close to 100 boxes a month, and I still get excited when I see them at the front door,” said Liz Cadman, the founder of the My Subscription Addiction, a website of reviews.

Investors are making big bets on subscription box start-ups like Blue Apron, which mails its subscribers weekly deliveries of recipes and the ingredients to make them. The three-year-old company, based in New York, recently raised $135 million in a deal that values it at $2 billion. Blue Apron says it is delivering more than three million meals a month, three times the number it shipped nine months ago.