; and (ii) permit grant recipients to receive and retain any funds or benefits received from— (I) scrapping a diesel engine; (II) transferring or repurposing a diesel school bus as authorized under a waiver under paragraph (6); and (III) the resale or reuse of other parts of a school bus replaced using grant funds. (C) Grant amounts (i) Maximum amount The maximum amount of a grant under the program is $2,000,000 per eligible entity. (ii) Amounts for purchase of electric school buses (I) In general For any grant under the program, the amount of funds awarded for the purchase of an electric school bus shall not exceed 110 percent of the amount equal to the difference between— (aa) the cost of an electric school bus; and (bb) the cost of a diesel school bus. (II) Determination of cost of school buses In determining the amount of funds under subclause (I), the Secretary may determine the cost of a school bus for the purpose of calculating the marginal cost under that subclause through— (aa) a competitive solicitation process for the manufacture of the school bus; (bb) a cooperative purchase agreement permitted by the laws of the State in which the grant recipient is located