SoftUK are selling "Star Trek Tactical Assault" for the Nintendo DS for £6.99.
Use the code "Cheap Games" (without quotes) to get free delivery.
You can get cashback via some sites (e.g. 2% Free Fivers, making it £6.85). You can also get 6% cashback through SoftUK's 'Collector' program
£9.99 is the next best price, from Play.
PLEASE NOTE: SoftUK has recently had periods of time when the site has been down, so if you can't get it to load, try again later. :-)
Star Trek: Tactical Assault is a real-time spaceship combat game for 1 or 2 players, featuring a wide array of authentic Star Trek races, ships, and weaponry from the universe of the original Star Trek series. Players take command of powerful Federation and Klingon warships and must outthink and out duel their opponents in order to succeed. Play through either the Federation or Klingon campaigns in single-player mode or go head-to-head against a friend in wireless multiplayer action.