Password Management system with automatic password changes

I’m looking for a password management system that:
– centrally and securely stores all kinds of passwords to web/ftp
servers, database servers, routers, etc
– allows various employees with different access privileges to login to
this system and retrieve single-use passwords
– automatically changes these passwords after usage

Cyber-Ark makes exactly this (albeit with limited connectivity to
certain hosts/platforms only) but it is way beyond our budget. I’m
looking for something that’s under $5000 to implement.

Any recommendations? TIA!