@greg79, Unfortunately, there are no special discounts that i have ever heard of. The prices are generally quite low. You might be able to get a discount with the top tier (Bell/Rogers/Telus), but it would be a discount off of a much higher price point. You would end up paying more in the end.
@greg79, there are no advertised discounts of this nature. You might consider reaching out to Public Mobile and asking them about possible offering in private.
@greg79, unfortunately to my knowledge, no provider offers a "disability" discount. They may offer senior plans (i.e. limited minutes and texts), or some call it an emergency plan, but there is no disability discount in the communications industry to my knowledge. You could contact PM directly but I highly doubt they'll provide anything. They'll probably say go to the lower priced plan.