It depends if you want to make them yourself or not. I went to Fine Finish Invitations in Flemington, and they were so helpful when talking about my DIY invites. They specialise in hardcover invitations in terms of what they make themselves, but they're incredible.
I'm spending about $191 on around 50 DIY invites (not including envelopes)- you can see my mockups on my S&T.
Hope that helps