I have a pair of these :
West Marine: Huahine 7 x 50 Center-Focus Binoculars Product Display
and I have found them to be very tough and inexpensive. I have owned them for about 6 years and I have not been kind to them.
There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217