Yes, the
USCS covers recommended by
blcjr are great. I ordered 100 (the minimum order), and at that order size they're still only $0.15 USD apiece.
They're of good construction, attractive, have an appealing texture, and take laser printing like a dream. The site claims that they are of archival quality, and if you take their word on this, I don't think there are better envelopes out there.
Back:
Printed example:
Edit: I should note that what you see on the printed example, around the printed portion, is not ink bleed — it's an intentional "torn paper" effect I added for artistic purposes. The edges are super-crisp under laser printing.