I got my wedding invites from Wedding Paper Divas - and thought I got a pretty good deal for what I ordered (invites w/inserts, thank you cards, special envelopes, etc) and was very happy with their customer service too. I found my rehearsal dinner invites on Etsy, though, and I think I spent $40 for 25-30 of those and they are adorable. Invitations by Dawn also has great DW invites that are unique too. Just depends how "into" invitations you want to get.
I think in the end, the people that really appreciate the invitations are either the newlywed or brides-to-be since we all know what goes into choosing them!