I DIY-ed just about everything for my wedding to save money, so wedding stationary companies were not even on my radar. Vista Print has absolutely gorgeous options for everything from Save the Dates, to Invites, to programs and more. I ordered all 3 of these items, as well as RSVP cards and 2 address stamps and all turned out perfectly. I was able to design everything to match and used their print that mimics the look of gold foil (it's not foil, but is printed to look like it). Anyway, their shipping is lightning fast, they always provide a coupon to use for your next purchase and have promotions that run in conjunction. Most importantly, their products are customizable and inexpensive. I believe I spent only about $250 on ALL the above products for 100 guests.

I paid just under $30 for 100 Save the Date postcards. Try that versus 160+ at WeddingPaperDivas.
You can customize the images/text in absolutely any way you like, and there is a variety of materials available.
You can also customize the back of the card, and they will even mail the cards for you (for another $20, only $3 more than the $17 shipping.) I still had them sent to my house because I wanted to add personal messages myself, but that's a really nice service.

They print all kinds of things and cost WAY less than other vendors. I was very pleased. One color was slightly off, but that was only because I could't see the difference on the computer (so my fault, not theirs). You can use pantone codes to avoid that.

I chose VistaPrint for my cards. I was able to customize the cards (using my beautiful engagement photos) and the cards came out beautiful. VistaPrint had a sell going on so i was able to get around 150 cards for only around $30!!! Great value and we are in love with the cards!