ZelloWork pricing is:
$6/user/month for accounts less than 100 users
$5/user/month for accounts with 100 users or more
Annual subscriptions are available, and provide a 15% discount.
Pricing is prorated daily here at Zello. Admins can modify subscriptions to increase or decrease the amount of users in a network at anytime during the subscription for a prorated charge or credit.
Subscriptions may be cancelled at anytime, and customers will receive a prorated refund for the time left in a subscription.