WALLBUYSFANTASY was the last one I used when I ordered 2 Y3's and yes, seems to no longer work. Can't find any others currently active. They may have stopped the promotion, or it's temporarily unavailable. Generally, all these dealers seems to slowly drop the value of their deals - WB did this with the instant kills for example.
I emailed Cherry just now requesting a new discount code for BLF - hopefully she can deliver. The Y3 is still well worth it at $31.65 though, but a 5% or 10% discount would still be nice...