What is Actual Cost?

Legal Definition
The acfual price paid for goods by a party, in the case of a real bona fide purchase, and not the market value of the goods. Alfonso v. United States, 2 Story, 42l, Fed. Cas. No. 188; United States v. Sixteen Pack ages, 2 Mason, 48, Fed Cas. No. 16.303 ; Lexington, etc., R. Co., v. Fitchburg R. Co., 9 Gray (Mass.) 226.
-- Black's Law Dictionary