I'd like to add a cake box too question if I could...
Where can you find tall ones? Most I've seen readily availalbe are only around 6" tall. I like to make TALL single-tier cakes, so I'm looking for boxes for a 9" round that's around 9" or more tall. I have seen them before at bakeries but not at a supply store yet.
So we need both sturdy and tall cake box sources...
I have been using regular shipping boxes because cake boxes are very flimsy and they are not very tall either.
I make the boxes pretty by using scrapbook paper or stamping on them.
This way, if I have a problem getting the cake down into the box, all I do is slit the sides down and then tape them back up after putting the cake inside.
I get mine from Uline. They have great prices! I buy the Cube Boxes and the flat boxes (for sheet cakes)
The last sheet cake I made was 5 inches tall by itself not including what the cake was sitting on! So, My 10 inch tall box works great!!
Here is their site
http://www.uline.com/Browse_Listing_402.asp?desc=Cube+Boxes
I almost forgot!
They sell white boxes too!!!
http://www.uline.com/Browse_Listing_425.asp?desc=White+Corrugated+Boxes
try www.papermart.com and www.instawares.com.
I buy my pink boxes from papermart.com all the time!!
You should check at your local walmart. I've bought a couple there before. You might have to check with a bakery manager as not all the bakers know if you can, and they just say no. I've also had them just give me one when I just needed one.--Very nice of him. 
Also, try calling those bakeries that you've seen them at and ask them where they buy them.
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