special discount for selected customers

[ipodskins]

hi

i was wondering if there was a way or even a contribution to allow a code to be entered and to be deducted from the order total!! i dot really want a gift certificate, but more of a promotion code or money off voucher, that i could give to special customers!!!

 

i want something that will allow the code to only be used once!!

 

any ideas guys, im sure this must have been done before but i jujst cant find it in the the contributions or im searchjing dfor the wrong thing!!!

 

any help would be appreciated