Went looking for this on NZ/UK/US retail sites only to find it on an NZ deal site. Cheapest alternative I could find was $136.50 incl shipping via trade me so this seems like good value in comparison if you don't mind waiting a bit for delivery. I paid $5 extra to get it sooner.
The deal site also allows various combinations of the base and expansion packs to be purchased
http://www.drgrab.co.nz/products/cards-against-humanity-base-and-expansion-1-5