I got a big supply from Graphic 14 in mundelein IL before I moved. Since I codul go pick them up, it was a SUPER deal because I didn't have to pay shipping. However, I just re-ordered from them because I am running low and have a million Christmas cards to send out, and the total for a box of 250 of each color was just under $38 total, including shipping. This makes them a tad over 7 cents each as opposed to the 14+ cents each SU sells them for. Can't beat that!
Here is their number in case you are interested, I don't think they have a website. Graphic 14 - 847-362-9650
I ordered the Size A2 Neenah brand envies in Solar White and Classic Natural White, 250 count in each box.
HTH!
Trish