I got mine at Walgreen's. I can't remember how much they were, but I know they weren't too expensive because I'm cheap when it comes to things like that!
I bought them from tinyprints and they were expensive, around $100. I later discovered peartreegreetings.com. They have really nice ones and are way cheaper than tinyprints. I recently ordered my Baptism invitations from them.
Vistaprint and they have a thing going where you can get 20 free but you pay shipping. You can actually get more than 20 free if you choose different designs.
Shutterfly.com I got 50 for $26 and they are offering free shipping on orders $25 or more with code ship25.
I got the announcements in 2 days! They are quick.
Also if you registered at Target you should gave received a $20 shutterfly gift card. If you didn't just go in and ask for a gift bad at customer service for your baby registery. Then you'll only pay $6 for your announcements :-)
HTH
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Re: birth announcements
Katie: 1/16/08 2lbs. 15oz.
Abby & Emily: 12/31/10 6lbs. 2oz. & 5lbs. 7oz.
Vistaprint and they have a thing going where you can get 20 free but you pay shipping. You can actually get more than 20 free if you choose different designs.
www.vistaprint.com/share
I designed mine myself in Photoshop and then printed them for $.09 apiece at Walgreens. Supper cheap and they turned out really nice.