The fee for inspection stickers shall be $3.25 for each sticker furnished an approved inspection station. The division shall transfer $.25 of each fee collected under this section to the motor vehicle air pollution abatement fund established by N.H. Rev. Stat. § 125-S:3 and $.25 of each fee collected under this section to the general fund. All unused stickers returned by the approved inspection station to the division shall be refundable at the rate of $3.25 each, except that unused stickers purchased from the division for a fee of $2.50 shall be refundable at the rate of $2.50 each.