Additional website licenses are less than half of the base subscription you have for your first site! The cost for the additional websites would be:
Essentials Plan- $35/site/month*
Premium Plan- $55/site/month*
*Your MLS pass-thru fees may still apply
If you choose the yearly billing option the pricing is:
Essentials Plan- $420/yr*
Premium Plan- $660/yr*
Need to know how to add another website to your account, you can learn more here.