try the link below and see if someone there can help you with info. I find the board very good.
http://forums.arcr.net/
from personal observation, CR is nothing like a city in the US or Canada, where we have pretty good accommodations in daily life for disabled persons. as above was pointed out, the infrastructure for the disabled is not the best in CR.
help, perhaps even qualified help, will be much cheaper than back home though. so will be lodging and food, if you live like the locals. heating bills will be unknown, depending where you settle, and so will be winter clothes.
biggest hurdle is the immigration law:
Rentista - Requires a $60,000 deposit to a qualifying Costa Rican Bank. This must be paid again in 5 years. You must convert $12,000 per year to colones and keep proof that you did so. You may also use a bank guarantee for this.
Pensionado - Requires proof of at least $600 per month from a permanent pension/retirement fund or equivalent, for life.
there are restrictions with each of these as well, so check the link above.