Looks like they are now offering a bivy with a Event-like fabric top for $189:
http://shop.bivysack.com/product.sc?categoryId=2&productId=30
email from David:
I have some bivys that are 2 layer PFTE top silnylon bottom with the
identical breathability as
branded eVent. Figures from Richard Nisley.
Water Diffusion g/m2 24 hours
eVent 27.826
PFTE non branded 27.826
Air Permeability
eVent 7.14E-11
PFTE Non branded 7.14E-11
Can anybody speak to the quality of Oware bivys or have any detailed pictures they could show?…Unfortunately his website is sorely lacking in quality images.

