In this specific instance it's $199 setup fee + $40/month + $4/month/user so really nothing too wild. I don't know what the others charge but I am not willing to play the game to save a couple of bucks here or there.
Also, they ask you to qualify the size of your company before giving you pricing (e.g., "Small business 1-50 employees click here"). I would be cool if they had a high-touch process for companies with more complex needs but at this level, it's really a plain-vanilla service.