"We also have a box of shakers, maracas etc for them to beat along with."

As an aside, there are studies out now that seem to show a positive effect for dementia patients if they can do some percussion activities. Keeps some of the brain synapses properly functioning.

I'm sure it wouldn't hurt to ask if the home could defray expenses or pay outright... on the other hand, maybe that $ would be used to provide different entertainment for other residents.

Too many variables to apply one set of standards for all situations.