if you have over 50 domains in your account, email them, and they'll assign the permanent discount to your account. you'll still have to use the coupon code, but it's always good. the discount code that i've seen over and over (including my own account) is GOLDDEAL. but if you don't have 50+ domains in your account, just google "namecheap coupon", and you'll find the current one of the month