There are many things to think about here and it is important to get some specialist help to make the decision.
My son has had the use of a shared communication aid whilst he has been attending school. Neither the school nor the speech therapy department have the funds to pay for individual machines.
Several suppliers of AAC equipment provide useful funding information, which applies to the wider issue of funding and not just their own equipment:
© 2013 Communication Matters - Research Matters, created in collaboration with Manchester Metropolitan University.
Communication Matters is the working name of ISAAC (UK) Registered charity no. 327500. Company registered in England & Wales no. 01965474.