There seem to be a few out there but watch out for the bleed valves on E-bay as they are complete garbage.
Here is an unbranded one that doesn't come as a "kit" for £16:
http://www.ebay.co.uk/itm/Uprated-U...arts_Vehicles_CarParts_SM&hash=item2ec9774714
Get a couple of metres of braided hose along with clips from your local hydraulics shop for a few quid and you can change the feed to/from the controller at the same time. Look for one on yell/google if you don't know where it is.
Alternatively spend £50 on a branded one as a kit.
The one I found after 30 seconds of searching isn't pretty but looks decent quality with a strong spring and ceramic bearing. Sometimes these are branded as "Race" dawes device for double the price!
Whatever boost controller you use, keep the hose length from the manifold to the turbo actuator as short as practical. It will allow the controller to do it's job.
With all this money you're saving you can buy a 3" front pipe and a proper map
I'd wait for other comments from the forum first before doing anything, I don't claim to be an expert on buying Dawes devices.
Jim