Well I searched for you and here is the link. There is a recipe and a video on how to make them
http://www.marthastewart.com/portal/site/mslo/menuitem.fc77a0dbc44dd1611e3bf410b5900aa0/?vgnextoid=87b0cf06cd80f010VgnVCM1000003d370a0aRCRD&vgnextfmt=default
Stephanie
Here is the link to the Martha Stewart stacked wedding cookies. It has a video on the link too:
http://www.marthastewart.com/portal/site/mslo/menuitem.fc77a0dbc44dd1611e3bf410b5900aa0/?vgnextoid=87b0cf06cd80f010VgnVCM1000003d370a0aRCRD&vgnextfmt=default
Elisa Strauss also has a version in her new book. I think those are cuter than MS's version.
I made these for my sister's bridal shower. I used Martha's link but, there wasn't a video when I made them.
They were a big hit at the shower. Can't wait to see yours! 
Would you happen to have a pic of your cookies? Also how far in advance can you make this? Can you freeze them?
I made these for my sister's bridal shower. I used Martha's link but, there wasn't a video when I made them.
They were a big hit at the shower. Can't wait to see yours! Would you happen to have a pic of your cookies? Also how far in advance can you make this? Can you freeze them?
Not the best picture but, here's a photo of the ones I did.
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=45725
I baked the cookies two days before the shower and decorated/stacked/packaged the day before the shower. I made 75 of them with 9 cookies each. That was a lot of cookies! One of my cousins helped ice and stack them. I couldn't have done that many without her help. I made a 3 tier cake as well, it was a long night! 
Sorry I can't help with the question about freezing - I've never tried with sugar cookies. Hopefully, someone else can shed some light on cookie freezing for you.
revel- You can certainly bake the cookies and freeze them naked- I know people say you can also freeze them iced, too- but I'm always too scared to take the chance- I would bake and freeze all of them well in advance- and then just thaw, ice, and stack. Have fun!!!
Thanks! I bought the boxes from www.papermart.com
http://www.papermart.com/templates/83-0-80.htm#GO_83082
They are clear PVC Tuck Top & bottom boxes (I bought size 4x4x4).
One tip for those cookies is to ice and dry them before stacking, then glue them to each other with a dot of RI in the center. If you stack them before the icing dries, they're difficult to get apart for consuming and can break, crack, and crumble while trying to wrench them apart. With a little dot of RI (obviously, enough to hold them together securely), each cookie will pop apart whole without compromising the rest of the stack.
Zahrah - that's how I made mine, ice, dry and "glue" with RI.
I'm sorry I'm not much help on pricing. I made mine for my sister's bridal shower, so I wasn't really thinking about what I should charge. I remember reading (when I was making them) that others charged upwards of $9.00 - for each favor, depending on the size/# of cookies used.
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