Raymond's here, Raymond's here
But they are also so expensive. A new 20 sheet box of 4x5 Type 79 polaroids was about $75 at the local photo supply stores. I want to make cards and such things with them so I'm looking out for expired boxes now, but they never have the color kind.
I used a little magic-black-plastic-machine to transfer 35mm transparency to the 'roids. The best thing ever is the color controls that I was too afraid to mess with because I didn't want to waste any. But lately I've been dreaming of the possiblites.