In reply to mmmmcake:
Ohh gotcha, you probably wont find much in that price range unless you go for ebay or something from here. Normal cost comes in at around £180/200 for gore tex and most will be quite featured/ technical.
Berghaus used to do simple rainpants in their aquafoil and also gore tex performance shell for around £100 or so, but even now its £200 for a simple pair with a mesh liner.
Other than that you would have to start looking at other membranes from various manufacturers to find something that is as un-featured as you require.
Put out a wanted advert here, see what comes up!