Just in case this helps anyone-This may be old news but I was excited!
I found some really great, semi-pre-made wedding invites at Michael's Craft store! They are nothing real fancy but for someone on a budget the price is right and they have different designs and colors to choose from. You print right on them and they give you directions-you could even spice them up with some rhinstones or something.
Regular Price is $40 for 40 invites, envelopes and response cards-but if you sign up online and google Michael's coupons you can get 40% off 1 item a day. They end up being like 50 cents per invite.
Again, this may be old news but if not, I wanted to pass along the good prices:)