I can certainly understand why community facilities would not offer it - it cuts their income in half. Reimbursements are made by insurance and Medicare based on the number of treatments (ridiculous!).
Accuray has a website where you can find CyberKnife
locations, but you have to check each
location to see if they treat prostates with it:
www.cyberknife.com/locationsVarian has a similar site (I guess if you select RapidArc, the SBRT uses would include that - but again, not necessarily for PC):
/www.varian.com/oncology/treatment-locatorI couldn't find a similar site for Elekta.