Look for one that posts its prices publicly; that is, you should not need to register for an account to find out what you will pay. I researched that a while b

Look for one that posts its prices publicly; that is, you should not need to register for an account to find out what you will pay. I researched that a while back. The only one I found was name.com, which I recommend for other reasons as well. If a registrar won't admit to all their prices without requiring a login, you're likely to find a bait-and-switch taking place, for example it is common for renewal fees to be quite a lot more than new registrations or transfers.