Pen-y-bryn Lodge is offering a Name Your Price deal for Kiwis. Description on how to do it is on their Facebook post (in the link).
Basically it's a bit like an offer/counter-offer type deal - if your price is reasonable, they'll accept it an confirm your booking, if you low-balled too hard they'll let you know it was a bit of a cheap shot and you can renegotiate the price from there.
Note that this doesn't apply to their Gourmet Dinner - this will be charged at the standard price.
Normal room prices start from $550/night (2 people). They recommend at least 2 nights stays to make this deal worthwhile (for them).