Weddingbee boards

(I don't know the exact websites--sorry--just google 'em)

Oriental Trading Company (decorations, kids' totes, favors, candles...seriously, they have tons and tons of stuff)

Dollar Tree, Inc (ditto)

Etsy (for hard-to-find, hit-nail-on head items. If you need a "placecard with a purple hibiscus flower border" this is the place to look (or request an order for exactly what you want)

The Paperwink (not the cheapest place, but really cute custom mailing labels and return address stamps. They don't advertise on their site but I asked once and they said they can make self-inking stamps by request)

Stamp Francisco (my favorite place to purchase rubber stamps--sort of a Victoriana bent to them. Leavenworth Jackson out of Bekeley is also fun, but not as convenient to order from. So is Paper-Source. I'm um..a stamp dork, obviously)

Direct from Mexico (luminarias, paper flowers, etc.)

Paper & Ink Arts (calligraphy supplies)

Have fun!