Discount Voucher Codes, if available from 3M Select, provide an opportunity to get a discount off the advertised price. Not all online shops offer what is often referred to as e-discount codes, e-vouchers, online discount codes or online coupons, preferring to provide regular online promotions and special offers. If a voucher code is therefore not available it is likely that 3M Select have included all discounts in their advertised price.