I got the fire extinguisher from a mate. which i used paint stripper on and sprayed with matt black paint. (if your interested in one i can get one for literally postage cost)
I also got a diffuser, bubble counter, check valve and drop counter off ebay quite cheap. So all together id say no more than £60
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ive tested it and it seems good,the adjustment is really accurate. im waiting on a drop checker as i can only find ADA ones in my lfs and £60 for a bit f glass seems a bit extreme! so havnt had it on properly yet for fear of kiling the fish!!