Well I have a $15 RZ cert, so I can get any $50 item half off? Hmm...let's see.
EDIT: On a lighter note, I see that Sims Late Night has dropped from 29.99 to 19.99, I picked that up about 3 weeks ago for one of my fiancee's Christmas presents and paid part of it with the $20 hitman giftcard. Can you PM their guarantee if you paid with a GC?