Version control for database objects

The database our developers are working on is too large (have a lot of database objects). We have to control db objects changes (change management). Our company cannot have a person who would be responsible for db changes only. So we need a source safe for database objects, something like version control for standard code, but more related to database, that can synchronize database and scripts. What is the best one. Reliable, Cheap, Functional - choose the two ones :)