you could also design them yourself and get them printed either by a local printshop or a service like vistaprint.com (which I used on my STD's (hehehe...that always makes me laugh. anyway...). Like I said, i used vistaprint for mine, (I designed them too, but I think they have some premade designs you can pick from too.) and I did mine as just postcards (saved a bit of money since I didn't have to pay for envelopes) and I got mine within a week.

If you're crafty & cheap (like me), it's a pretty good deal and it's very fast.

Now i just have to get them all addressed & mailed!