LEGO Lord Of The Rings on PS Vita for £15.70
The full price for this game from Amazon.co.uk including shipping comes in at just £21.24 (or $30.70). That makes it a far cry lower than the likes of Australian gaming merchants like WOW HD, JB Hifi, EB Games and Harvey Norman (where prices seem to range between $55 to $75).
After scouring around the only other place that I could find which appeared to beat this was from OZ Game Shop at $29.99 with shipping. However, when clicking onto the link it comes up as $31.99.