What kind of focal length are you thinking about?
Somewhere about 18mm gives you an equivalent of 24mm on a full frame (in old money if you are used to SLRs!)
You can use manual lenses without too much bother as the depth of field is so much greater at short focal lengths making focus a lot less critical- unless you are very close to the subject.
Older, decent wide angles still cost quite a bit. 24mm was considered very wide back in the Eighties.
A more modern lens with an internal motor is more practical and cost effective for you, I would have thought.
Tokina, Tamron and Sigma make pretty good wide angle zooms.