Reserve
From Roll20 Wiki
Pro users have access to the Roll20 Reserve, a monthly, curated reward as our way of saying thanks for playing on our site. The Reserve reward may be a map pack, a module, a token pack, or anything that might make your games better.
You gain access to the Roll20 Reserve with a Pro subscription, and each item is available for only a month to claim. After the free Pro-exclusive month, Pro subscribers and all other users will be able to purchase the item on the Marketplace. Once you redeem a reward, it’s in your account forever, but you must have an active Pro subscription to claim it for free upon release.
Roll20 Reserve is updated on the first Tuesday of the month. Keep an eye on the Roll20 Blog to see what’s available each month from the Roll20 Reserve. Not a Pro user? Learn more and sign up here.