I have to share this site that I love to buy clear all varieties of clear envelopes. I stumbled upon this site a few years ago and I love what she does with her proceeds.
Clear Envelopes by Amber Shaw
She uses all the money she makes off the envelopes to send cards to our troops who are deployed.
I've ordered the A7+ size and have used them for a number of projects. They are awesome. Great quality and great service.
You have to go there today and ALWAYS order your envelopes from her.