I just ordered my cards from Costco and it was such a good deal! 50 for $34.50 (w/ rounded corners even) and 17.25$ for sets of 25 after that. They include custom-addressed envelopes as well. They are cute!
Here's a screenshot of ours (before I customized it w/ our shit)
I wish I had known that Costco does premium cards now!
Next year! I'll let you know how they turn out. It's kind of nice to be able to pick them up locally, although they must mail them to the warehouse bc they say they will be ready in 5-7 days.