inexpensive CRM-type product

SUGGESTED

A customer on Sage 300 v 2014 does not have the budget currently for SageCRM.  They are looking for alternatives that would provide contact management and case management.  The want to be able to see Sage 300 transactions in the CRM product, but not expecting to be able to enter transactions in CRM that flow to Sage 300.

Their budget is a number they picked out of the air (less than $5K for 12 users).  

Any suggestions?  Other than increasing the budget?