The prices I posted previously are what the registrars pay to Verisign per domain. So you pay $9.89 to Namecheap for a .com, Namecheap pays Verisign $7.34 of that.
As far as Fabulous, they use Tier's - it's all about how many domains you own. But even at their highest price, they are cheaper than Namecheap.
http://fabulous.com/informationcente...[qid]=1317
The only thing with Fabulous is unless you email them asking for a wholesale account (and providing a sample list of your current domains), you pay out the arse with their "retail pricing".
They are quite reputable though, and very secure. They've been around for 13 years I think?
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If you want to try them out, and you have any problems, let me know. I can get a hold of the CEO =)