Nsblum, I think the postcard Thank You note is a great idea. We might do the same. Our postcard designer offered the option of clear or kraft paper envelopes for the postcards as well. I decided to send them without envelopes and have been getting them back no problem. We ordered them from Beyond Design on etsy http://www.etsy.com/shop/beyonddesign?ref=seller_info She was great to work, well priced with and can really do anything you'd like.