the question is do you just want a narrow band gauge to read off you stock sensor. Doesnt really tell you much, if yout hitting 14.7:1 chances are you are pinging on boost at 13.5 and wouldnt know it without a logger.
around 300 will get you a full innovate lc1 wideband kit
Yeh thats way to much for me to spend right now, i do have a logger though and looking for one to read of the stock sensor for starters and when i get things on track i spend abit more