I have a set of Whitewater cabinet decals, latest generation, bought in 2013 from Planetary Pinball and still in the original box. Also an unused Diner cup. Check with me for details since I'll need to confirm the price.
I also have a set of old Whitewater ramps. These are useable but most of them are fairly beat up. I'd let the whole set go for $20 or give them free with any other purchase, assuming you have a WH20. Ditto my old Cyclone ramp.
I am sure I have more if I rummage around a bit. I'll see what I can add later.