The Calendar is shipped via Canada Post Letter mail. To ship by letter mail, the envelope cannot be heavier than 500 grams. Limit your purchase to a maximum of two calendars per mailing in order to obtain this flat rate. If you want to order more than two calendars, we will have to charge you an extra fee for a parcel rate based on weight and size. This is done via an emailed Square Payment invoice, instructions are self-evident for payment. Remember there is now a fuel charge added to parcel rates. Flat Rate within Canada remains $7.00 Flat Rate to the US is $12.00.