Keep an eye out for an used auto flash. It'll make your life easier. Many aren't very expensive used.

If you want real cheap then look for the Agfatronic 383cs. It's got auto mode and TTL with Metz modules. I bought one for less then $20 US. 38 metres for the guide number. Built in wide angle reflector. Second smaller flash on the head. Only uses 4 AA batteries. Nobody else seems to want the things.