I have been hunting for years with Nikon Action porro prism like this:
http://www.amazon.com/Nikon-7216-Action-8x40mm-Binoculars/dp/B0001AOGAO
or this:
http://www.ebay.com/itm/Nikon-Actio..._DefaultDomain_0&hash=item1e7ef0c9af
and had never had a problem. They are not as sexy as a pair of Swaro's but I have spotted elk with them just fine.
And, if you look around you can find them for $50.
P.S. BTW, people under-appreciate porro prisms. Inherently, they are much easier to make because the light does not fold back twice through the same glass, and image quality is superb in porro prisms even without phase coated optics that are necessary in roof prism designs. Without phase coats the roofs will have strong color fringes, which are not present in porros.