Additional website licenses would be half the price of the base subscription you have for your first site! So the cost for the additional websites would be:
Essentials Plan- $30/site/month*
Premium Plan- $50/site/month*
*Your MLS pass-thru fees may still apply
If you choose the yearly billing option the pricing is:
Essentials Plan- $360/yr*
Premium Plan- $600/yr*
Need to know how to add another website to your account, you can learn more here.