For that price I can do you a binliner.
just wondered what your max budget was?
**Dont know if it's what your'e after, but I had one custom made by a guy called John West in the USA. [Nothing to do with the tinned fish bloke...]
After a fair bit of specifying, and some custom alterations, for just an extra $5[!], he made it and I've been very happy with it.
[He doesnt charge for extra material!]
For the UK, he recommended M90 [instead of M50] as an outer, and Silnylon bottom, extra wide at the chest and shoulders, and legs with side zip/ nano no see-um mesh.
I got it delivered for £60. From the States.
To be used with a tarp of course.
I think mine weighs 200grams.
Dave you are a god. ive been looking for something like this for a long time.