Hi guys... This is probably old news to many, but I just found out about it. If you go to the Postal Service website...USPS.com ..... you can get various and sundry flat rate mailing supplies delivered to your mailbox free. The boxes are available in various sizes, and there are envelopes as well. I got ten boxes 12"X12"X5 3/4" just the other day. They ship priority mail for $4.99 flat rate up to 70# ! it's a smokin deal and USPS sends the supplies to you free. other boxes and the envelopes all have different flat rates and weight limits.
go to the website, and dig around till you find the flat rate stuff..............ModocDan