If you're selling a product, it doesn't matter if it's online or on a shelf, you need to display the price in a clear manner. There is no way in hell I am going to buy from a company that can't get simple advertising correct.
I am namely talking about Spanning Sync. This application sounds like a god send and does exactly what I want to do. Great! There's a download link for a free trial so I immediately know I there's either a paid version or something. How much is it? I don't know! I'll blindly download the trial, integrate all my shit into it and hope it displays a price inside the application.
I had to search the webpage with my browser (cmd+f > $) for the price, and guess what - it's only listed in testimonials. Jeez.