@amejia 

Should you need to purchase a single license for 3 users, make sure:

1. Your network environment. If all machines are not in the same network, you have to deploy a private cloud or put your license and data on a QBO cloud hosting to utilize the multiuser feature.

2. Consider using QBD Premier for your organizations. If you are eligible, you may purchase it for a special rate thru Techsoup. Otherwise you can purchase the QBD license thru a partner/reseller for the better price.