For more rainy than snowy days, consider these Colin Stuart wedge boots (pictured left in the three available colors). Made entirely from acrylic and polyester. Note that they have a 3" wedge, which may make them less useful for their apparent purpose of trudging through rain and slush. Originally $105, they are now $49.99.
There is also these Report wedge boots (here), which seem to be made from polyester and faux suede and faux leather, although the online description is not entirely clear (originally $110, on sale for $69.99).