Kwik Sight makes one B-Square makes one and there are others listed at Cabela's and other places. Best thing to do is go on line and shop for one at the best price but both companies above make a fair unit.
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
A Government that abrogates any of the Bill of Rights with or without majoritarian approval. Forever acts illegitmately, becomes Tyrannical and loses the moral right to Govern!