A lot of different Bicentennial covers were issued. The value depends on which one, and condition. On average you can pick them up for anywhere from .99cents to a couple of bucks. Again, without knowing which one, it's pretty much impossible to give a clearer answer.
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How much is a bicentennial 1776-1976 quarter dollar worth
$6,750.00
There were no bicentennial designs for cents, nickels, or dimes. If your coin is from 1976 it's worth exactly 10 cents.
25 cents
$6,750.00
Face Value
At least $2.75
1000
What is the value of a boston tea party bicentennial 8 cent stamp worth
About $18
1935? Whose bicentennial was that?