If you are looking for a fairly full featured and inexpensive domain registrar for .com, .net and .org names, try http://www.jumpdomain.com/

The killer for me was their email obscufation in the whois record, which allows me to minimise spam.

At the time of writing they are $US10 p.a. with transfers at $US7.99.

Within a dollar or so of the cheapest I’ve seen, and they do free mail redirects etc.