cardsandpockets.com was recommended to me as wide selection and reasonably priced, but I ended up buying local when I found a great deal so I can't say for sure. You might want to check them out!
Also, You can try any near by local paper places in your area. We have a place called the Paper clip here, and Ive ordered all my cardstock there, and it was really cheap. I love the cardsandpockets though, was a little high for me, but
love all the designs, If I could have fit it in my budget I def. would have went there.
Thanks deb - there was a little place that I was planning to use, but they have closed (I assume because Michaels opened a couple of weeks ago) I found another online place so now I'm waiting to see if my brother wants to save money but wait longer for the invites or if I should just get it all from Michaels!!!