A friend and I have experimented with the print on demand service called Touchnote.
They do it all, print, address and mail.
It's a little pricey, but the service and stock they use is quite good.
I've hung one outside in the woods and it has survived quite well for a year.
I know this is extreme, but I'm a testing geek, so a lot of print types get displayed in the woods behind my house for the critters.
The Touchnote is nice. Thick stock too.