What kind of board do you use for you cake to sit on? Like the bottom? I had only made smaller ones, and this weekend made a double layer sheet cake with a tinkerbell on top and it about collapsed on me! I just had it on a plain little cake board like I usually used 
and I am assuming that is what happened? It was just too heavy. What do you use for the bottom and where can I get them? Thanks!!
I use foamcore. Buy it at Michaels or Hobby Lobby, or even the Dollar Tree (though theirs is not as good). It goes on sale every so often...usually goes on sale for a dollar each at Hobby Lobby and $1.25 at Michaels.
Cut it to the size you need with a box cutter. If you need several thicknesses, glue them together with tacky glue...I've heard that a glue gun does not do well for the cake board. I cover them with fondant and then glue a ribbon around the edge.
I use foamcore for the interior boards in a stacked cake too...just cover with press and seal wrap first.
I just use multiple cake boards. For the 12x18 sheet, I use 3 cardboards wrapped together. My cake supply shop told me not to waste money on cake drums ... they were just cardboards wrapped together and it would be cheaper for me to wrap my own. Since I wrap them in the fancy-foil, there's no need to tape or glue them together ... the foil holds them together.
Haha!--this is completely unrelated and I don't mean to hijack but Indydebi.. you have moved up and above our earthly CakeCentral ranks and have become our forum "Matriarch--" how fitting and I love it! Thumbs up to you and whomever gave you that title 
@OP and the topic at hand.. I usually just double (or triple.. depending on how heavy) up on cardboard boards/circles, glue together with a thin smudge of piping gel, and wrap tightly with wrapping paper and then saran wrap. I only do hobby for the most part so I try to keep it simple..Dollar Tree usually has great solid colored wrapping paper.. 30 sq feet for $1
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