I LOVE the Papery! I go here to purchase all of my cards and I thoroughly enjoy looking through their vast selection. Other reviewers have mentioned that the cards are overpriced, but I'm not too bothered by that. While I agree that they could be cheaper, I think the prices are comparable to Hallmark or Indigo, but the cards are more unique. You can definitely find a cute card there for under $5.
I typically only tend to purchase cards there, but they also have a wide selection of stationary and such. It's fun to look at, but I personally don't really have a need for it.
Be advised that you can lose a LOT of time in this store. Many a time I only mean to stop in for one card, and end up walking out stocked up with several an hour or so later.