You should say how large the envelopes are, and/or define how much candy (by weight) comes with each shipment.

Also, try to find out if there are candies which are sold only in Japan; I'm in NYC, and have lots of places where I can buy Japanese candy, but if there's something I can't get here, it will be more appealing.

Finally, you need to do something about the cost: I might try it if it were under $10 but $24 per month is just way too high.