I'm still planning on posting about the tools I used to make my own baby announcements, but I just happened to stumble upon this amazing website. The possibilities are making me weak in the knees!
Basically, you submit a vector file, and you can have it cut in acrylic, wood, felt, or other materials (37 total!). I REALLY need to spend some quality time getting to know Illustrator.
Also, Ponoko has means for you to sell items you make with their service, sell plans to have other people use in their order, or buy plans from other people (there are also a few free plans). They charge mostly according to how long it takes them to make your item, but they will give you a quote by email when you submit your design.