I found the following:
Not tried Adwords directly but tried youtube advertising, got the hits up a lot and eat through around £20 for 1000 views. 0 direct converstions
Reddit: Around $10 for 2 weeks, possibly 1 or 2 converstions
Facebook: Tried £5 got barely any hits and 0 converts
Now I'm trying paper based advertising and have brought 1000 flyers for £35 and a 3 month half page advert in a Linux Magazine (Which some of you guys may see soon).
The only issue with paper is that conversions are hard to track. but I should see or not see a correlation between sales and the advert going live in the magazine.