Habbo currently have this targeted offer on for some people. If you can afford it I would suggest buying it, you get 50 credits back anyway and a 1 month of HC which is technically 50 credits and 50 diamonds, so that's 100 credits back there. The Romantic Unicorn is averaging 40 credits at the moment so it's a bit of quick profit.
I'm not sure if there's any other targeted offers, that's just the one I've been given.