Rhinoback has discount programs for small businesses: 

The Small Business Package includes 1 Server account and 4 Standard accounts accounts for $109, you save $45.70 per month.

The Pro Business Package includes 1 Server account and 5 Professional accounts for $129, you save $50.70 per month.

If you are interested in one of these packages or other custom pricing please send an email to sales@rhinoback.com.