The Department is authorized to accept and expend for the benefit of any child committed to it, or for reimbursement purposes, any funds made available from any source, solely for the current maintenance and support of any such child, whether such funds be provided by the child’s parents, or other person, or by the U.S. Department of Veterans Affairs, the Railroad Retirement Act, the old age and survivor’s insurance provisions of the federal Social Security Act, as amended, or from any other source. In no event shall the sums so accepted exceed an amount in excess of the cost to the Department of supporting the child.