AB-SO-LU-TELY! (Though you would be in the minority) ;)
To purchase one box with no additional commitment, just select the box you want from our online store. You can view all our boxes available for individual purchase here.
Should you later choose to register for a subscription to take advantage of receiving the same boxes at a discount with free shipping to US destinations, the system will have a record of every box you've already received under this account.
If you've bought the Intro box individually and you sign up for a subscription, please put that in your order notes so the team makes sure you don't get a duplicate!