I'm happy to share what I did with our invitations. My mom helped us design them on photoshop and I sent them to Staples to print (40 of them for about $15). I printed the envelopes at home and then embossed them using an embossing machine. I got most the supplies from Michael's with 40% off coupons except for the embossing pattern or folder, the scoring board and the ribbon. I got those from wal-mart. My mom had the embossing machine so I didn't have to buy it.
They don't look 100% professional but I'm pretty happy with how they turned out. I'm sorry about the super large picture, I tried to resize but it didn't let me post the smaller one for some reason.