Over 500 bulk register

[cbk]

.....

 

[jdk]

Godaddy is the most I have seen around. For scanning lists, I use DRT which will allow you to scan up to 200,000 domains at a time.

 

[BostonDomainer]

Godaddy is the most I have seen around. For scanning lists, I use DRT which will allow you to scan up to 200,000 domains at a time.

ditto

 

[zabijaq]

Godaddy is probably best, great deals for bulk registartions, even those smaller. Great deals for multiple TLD purchase for 1 domain name

Read here about prices and dicount coupon lists:
http://www.scribd.com/doc/11650126/Domain-Registrar-comparison