dude, your best bet is to move to the Big Island! Everything with regard to medical marijuana is better. If you are on disability moving to the Big Island makes sense! I moved to Puna from Kapahulu a little more than a year and a half ago. I havn't looked back either. Though I have to commute to work on Oahu weekly, I wouldn't change anything.

If you are a renter on Oahu, it's better here....way cheaper brah! Plus if your disability has made it to were you can't drive at all. No worries, the bus on the Big Island is free!!!! No more two dollar crap for every time you climb on board.

Most properties/houses in Puna come with a good chunk of land. I'd imagine the smallest plot of land here in Puna would be a rather larger for Oahu.
I highly suggest you look into the Big Island. My friend moved here because he could no longer afford to live in Honolulu. He found himself a nice room(large) in a house in Hilo for $300.00 a month it includes utilities too!
Go online and look at the newspaper for the eastside of Hawaii. Look for property, or rentals:

Hawaii Tribune-Herald :: Hilo, Hawaii

Good luck brah!