I am definetely not a pro, haha, but from starting out the DIY project of boarding passes and finding what worked for ours I do have some little hints and pieces of knowledge I can share.
I can't speak for the envelopes as we also are having people RSVP on our site
Raffia only was sold in a bag for about $5 (Canadian) at a craft store here so we just bought it and I'm sure we won't use it all but it wasn't a huge expense either. I am not sure how much was in it exactly, we are planning on using a couple strings on each invite.
**Just a side note on tying raffia on invites, I heard from another bride on here how she had fat bows on her invites and they made her envelope puff up and the postage person automatically tried to charge her more so she pressed them down and the envelopes were more flat and they didn't question it as a regular piece of mail being sent, kind of funny and random so something to think about if you are sending out a bunch of invites and postage costs matter to you.
And I second the two sided tape dispenser thing, we used it for our boarding pass sleeves and to put our monogram on as well, its awesome. There are lots of kinds to choose from too - tape dots, solid tape lines, extra strong, etc!
Oh and another couple things I would suggest to make life easier would be:
- if you are making sleeves for your boarding passes finding something to score your cardstock if it isn't already as it does not fold well without a score line! There is a tool sold at craft stores but its rather pricey for what it is and how long we needed it for, so we used a dull knife type thing on the non-sharp edge
- a craft paper cutting board is also helpful with the straight edge ruler and the cutter making lots of parts of the passes easier, our stuff would have been terribly crooked with us just using scissors.
- a corner cutter if you want rounded corners on the boarding passes