Autoharp, other accessible instr (Terra Linda - San Rafael)

I run the arts program of a local nonprofit and we are trying to find some music instruments more accessible to those with or aging into disabilities. One that has been recommended is the autoharp. I'd love to have (or borrow) your unwanted autoharp so we can try it with our participants. Also looking for hammered dulcimers, zithers, and your ideas on accessible arts tools!