Pretty soon, I'll be opening a new etsy shop (details next week hopefully). I'm just getting everything prepared this week. Shipping supplies are being ordered, packing materials are being collected, etc.
I think I'm going to try and order my envelopes from CSN Stores. They're a website with over 200 stores where you can buy anything from a sofa to a suitcase (or shipping supplies). I'll let you know how it goes with their website.
Wish me luck! I'm pretty excited about this new adventure.