Cost wiki

[NathanKell]

Year in parentheses is date cost was taken; cost unless stated otherwise is in 1965 dollars.

Atlas (1960): 2.69m per LV
Redstone (1960): 1.076m per LV.
Little Joe (Mercury, 1959): 200k per LV (unclear, this may just be for the construction work, not including the 4x Castor in it) in 1959 dollars.
Vanguard (1958): 1.48m per launch (not per LV).

Please add anything else you know of!

[BevoLJ]

Here is a table I have been using: http://www.astronautix.com/articles/costhing.htm

It has all the prices and such adjusted to 2006 $