If you're living in Canada, you can find a voucher in denominations of $10, $15, $25, $30, $50, $75, $100, $150 and $200. These are available at online shops as well as brick-and-mortar locations such as Canadian Tire and Beckers. In the Eurozone and UK, you can find similar denominations. Keep in mind that different vendors may sell different sizes of vouchers.