For Facebook's signed_request function we must have an SSL certificate on applications and page tabs starting on 1st Oct. When I researched, we cannot get one for free.

I am wondering how Facebook decided that the number of business Facebook users will have to pay for an SSL certificate. Isn't there any other option for taking SSL free provided by Facebook? Or will they give the option on Facebook for buying one directly?

I can see there aren't many people who realise how big this issue is. I tried to call Facebook and asked some questions on the developer's blog, yet I haven't got any answer.