You dont NEED to go with verisign, just incase you didnt know that.. im sure you probably did. You can just use the "fake" cert that is generated with your ssl install.
However, it will popup a message when people goto your site saying its not certified.
But else than that, this topic has been discussed and the general answer is no.
So if you are going to do ecommerce and wish to look reputable you will probably have to fork out. If you are just learning or playing around, dont bother buying a cert, you already have one.
Hope that help and wasnt pointing out the obvious.