In addition to the usual care and services given by public and private agencies, the necessary cost incurred by the commissioner of human services in providing care for such child shall be paid by the county committing such child which, subject to uniform rules established by the commissioner of human services, may receive a reimbursement not exceeding one-half of such costs from funds made available for this purpose by the legislature during the period beginning July 1, 1985, and ending December 31, 1985. Beginning January 1, 1986, the necessary cost incurred by the commissioner of human services in providing care for the child must be paid by the county committing the child. Where such child is eligible to receive a grant of Minnesota family investment program or Supplemental Security Income for the aged, blind, and disabled, or a foster care maintenance payment under title IV-E of the Social Security Act, United States Code, title 42, §§ 670 to 676, the child’s needs shall be met through these programs.