OnlineGolf are currently selling 36 packs of Maxfli Noodle (soft and long) balls for £29.99. However, they're also on buy one get one half price, meaning you can get 72 balls for £44.99. I've been using these, and some more expensive TaylorMade balls recently, and to be honest I like these more. They're nice and soft giving good feel around the green, but don't mean you lose distance on the drives.
I usually pay £12 for 12 so this is a steal!