Beginning Jan 1, 2004, the consular section will no longer be able to return approved visas on the same day. After that date...... After that date, Canadian-based visa applicants may wish to bring self-addressed, pre-paid express post envelopes to their visa interview so that passports can be returned by overnight mail as soon as processing has been completed in lieu of returning in person for passport collection.

请问这个self-addressed, pre-paid express post envelopes是找canada post 买吗，大概多少钱？

谢谢。