There isn't a limit to the number of labs, equipment and users that you can add to Clustermarket. However, depending on your subscription level, the price may change.
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If you have a Core subscription, there is no price change for adding more users or equipment, but your subscription only covers one lab account. If you want to create a second lab account, you would need to start another Core subscription for this account.

If you have a Premium subscription, this is charged on a per user basis. Whilst there is no limit to how many users you can add, you would need to purchase additional user seats for your account, or simply pay for additional users on a pro rata basis. There is no limit for how much equipment you can add. Again, the Premium subscription only covers one lab account, so if you wanted to create another, you would need to start a new subscription for this account.

The Enterprise subscription is also charged on a per user basis. You can add as many users as you would like, but there would be a charge associated to additional users. There is no limit to the number of equipment, and you can also create multiple labs under the same Enterprise subscription at no additional cost. This gives your users access to multiple lab accounts all within your subscription.