Since I have already found the June Namecheap coupon, might as well post it here

Namecheap Coupon for June 2008: ROSEMONTH

Using this Namecheap June Coupon will reduce the fee from $9.29 to $8.41 domain registrations.
(note: This coupon will only work on new registrations, will not work renewals).

Not a lot, but still a saving

To use it, just enter this coupon at the checkout on Namecheap’s website.