I use Internet.BS (link in sig), they use PayPal and good pricing. .com = $7.75 .net = $5.75 .in = $3.85
Godaddy take Paypal. So do Dynadot. both are cheap... have never heard of Internet.BS before - but unlike most of the people that reply with crappy affiliate sites - Internet.BS is PR6 - so it could be genuine...
I would suggest Moniker.com over Godaddy. They are much easier to work with and they have cheaper registrations on alot of extensions.
The cheapest is depend on which domain extension you looking to purchase. There is none a single registrar that offering the lowest price for all their domain such as GD is well know for their .info cheap price.
I won't be the first one to say it, go with GoDaddy, and look around, they always have promotional coupons, sometimes you can get a .com domain for like $2 with those.
Thanks guys...man wish i read this earlier Internet.bs got amazing prices just bought a .in domain name from whiz.in for like $6(after adding funds) would have saved sum duh!!!
If you have lots of domain requirement then i would suggest you try out www.resellerclub.com I register all my domains from there.. Ani