PCCaseGear has the EK Predator 240 CPU liquid cooling system on special for $279 (down from $329) plus shipping. Amazingly, PCCG sells it cheaper on eBay and with free shipping — $272 (down from $360)!
Edit (thank you coco1458)
eBay Christmas special 10% off with code CHRISTMAS10 (thank you sus888)
Extra 3.3% cashback (worth $8.97) with CashRewards (thank you tightarse)
These extra discounts will expire on 15 December 2015.
End Edit
Pictures and most product info are missing from the eBay listing page. Please refer to PCCG website or manufacturer website for details.
Guru3D review 5/5
TechPowerUp review 9.5/10
YouTube video reviews
Good price if you're looking for something like this, cheapest is $329 elsewhere. Though I think computer enthusiasts might setup their own system.