It used to be a pretty sweet deal, for $60 you could get unlimited multi-domain multi-wildcard certs. Most other CAs charged more than that for a single wildcard cert, and noone else seems to even offer multiple wildcard domains in a single cert.

Which was quite sensible, actually. Charge for the actual costly process of manually verifying ID, and then allow for unlimited free domain-validations to be issued to the corresponding ID (which is the machine-automatable part).

After searching the web and comparing the different price rates, I just found a lowest wildcard SSL at $42/yr. at https://www.ssl2buy.com. I hope that you would not find cheaper than this wildcard SSL. As they did not charge any extra beyond the price and helped me to secure my number of sub domains. Even the backend technical support was good enough.