My invites are boarding pass style, and are 4x9. All the ones I have found aren't long enough. I really don't like how they look if I shorten them and I don't want them to stick out either.
I've checked out cardsandpockets.com and the min. they will allow me to order of the ones I can use are 100 and that's gonna cost $193+ shipping. I don't need more than 50.