We ordered 100 William Arthur invites from weddingpaperdivas.com for about $700. It's a little more than we wanted to spend but I'm soooo happy with them. Also, I figured that since I was actually saving money by having a DW as opposed to a traditional wedding, that I owe it to my guests who will be spending a lot of money to come to my wedding.
The invites, reply cards and reception cards came in sturdy boxes wrapped with ribbon. They even gave us four extra sets and tissue paper to put with each card. The ink is thermographic, which makes it raised and the paper is like 110 lb. (nice and sturdy, in other words). They also included a booklet with the traditional ways to stuff invites and address them. Very helpful.
We ordered them online and they sent us electronic proofs to verify and we received them a couple of days later. They also have live chat help if you have any questions. There were a couple of different beach themes to choose from but the formal ones looked nice as well.
We love them because they are simple and classic. I would recommend them in a heartbeat! Just wanted to let you know if you haven't ordered yours yet!