50 PCS Invitation Envelopes 18.5 x 13.5 cm, Burgundy Envelopes 5 x 7 Inch V-Flap Mailing Card Envelopes Quick Seal Envelopes with Gold Border for Birthday, Weddings, Graduations, Greeting Cards : Amazon.co.uk:
White Silk A7 Postcard Blanks & Envelopes | The Paperbox
50-Pack Brown Kraft A7 Envelopes - 5x7 Inches for Invitations and Cards | eBay
A7 Invitation Envelopes (5 ¼ x 7 ¼) - Navy Blue (50 Qty) | Perfect for Invitations,